What is the depth of field of a scanning electron microscope?
The depth of field resolution of the scanning electron microscope was not infinite, but there was no fixed value to accurately represent the depth of field. The imaging medium (electron beam) of the scanning electron microscope had good convergence, and the convergence angle of the electron beam was usually very small, so its depth of field resolution was often stronger than that of the optical microscope. However, when it came to special samples such as multi-layered materials that were placed almost vertically, even the scanning electron microscope could not capture all the details. The super-depth-of-field imaging mode developed by the Phenomena electron microscope could perform full-field scanning and other operations according to the depth of field of the sample, and obtain a scanning electron microscope image with unlimited theoretical depth of field. However, this was a special case, so it could not be used to define the conventional depth of field value of the scanning electron microscope. Read more exciting novels for free
Scanning electron microscope photography malfunction
Scanning electron microscope photography may have a variety of faults. The following are some common faults and related analysis: - ** Poor tube vacuum **: When the tube vacuum is poor, the 30kV-high voltage will be added to the grid cap for a few minutes, and the tube will be seriously polluted. The tube vacuum will directly affect the normal operation of the scanning electron microscope. Because the tube has a high vacuum, the 5 - 30 volts high voltage can work under good conditions, so the high-brightness electron gun can obtain a thinner electron probe. According to the working principle of the vacuum system, the flow chart of high and low vacuum fault analysis could be sorted out and drawn, and the part discrimination method could be used to check step by step, narrow the scope, and find the fault. - ** Weak image signal, small contrast **: When this kind of fault occurs, it may be caused by many factors. If the acceleration voltage is not selected properly, it is necessary to select a suitable acceleration voltage for samples with different conductivity, stability, and vulnerability. Otherwise, the observed image is not the true appearance of the sample. For samples with good electrical and thermal conductivity, such as metals, a higher voltage can be used for observation, such as 10 volts and above; for some samples with poor electrical conductivity but relatively stable, a medium acceleration voltage can be used, such as about 5 volts; for some samples that are easy to damage, such as high molecular materials, biological materials, etc., a lower voltage may be needed, such as 2 volts or below. - ** Interferential signal appears when observing the image **: Internal interference may be due to circuit self-oscillation, high-voltage ignition, large power ripple, etc. You can start from the three sets of low voltage of the vertical amplifier. If it is determined that the power supply itself has self-excited oscillation, it can be solved by adding a vibration elimination circuit between the two stages of the difference amplifier to reduce the output ripple to less than 15 millivolts. The sawtooth output wave is normal, thus eliminating the net interference on the screen. - ** Aspect problem **: Image dispersion affects image clarity, especially when taking high-resolution pictures (such as taking high-resolution pictures with high acceleration voltage and low beam current). The image would be stretched and deformed during the focusing process, losing its original shape. When the image of the scanning electron microscope showed some aberrations, the image would be stretched when it was focused. Antagonism required the experimenter to have a wealth of operational experience in order to accurately identify and eliminate the image. - ** Phenomenon of carbon deposit **: After observing an area for a period of time, there may be obvious carbon deposits on the surface of the sample. The surface of the particles seems to have a "thin film", which will affect the photo effect of the sample and reduce the clarity of the image. It will also affect the accuracy of the energy spectrum analysis of light elements. The main source of carbon deposits was the sample.(contact with grease and other impurities during preparation or storage), electron microscope components (for example, the vacuum system of the scanning electron microscope has an oil pump, and a trace of oil vapor enters the electron microscope chamber; improper operation may cause the sample to pollute the accessories, etc.), operators (contact with samples and accessories may cause pollution), electron microscope room environment (electron microscope and samples are exposed to a dusty environment for a long time, or powder sample preparation in the electron microscope room may cause powder floating pollution), etc. In response to these situations, corresponding measures could be taken, such as cleaning and drying the contaminated samples with alcohol and other organic liquids; for the vacuum system of the Feiner electron microscope, which was an oil-free mechanical pump, the user should properly keep the sample cup, store it in a sealed bag or a clean box when not in use, and wear gloves to avoid grease contamination during operation; the operator should wear gloves or use clean sample preparation tools to operate; do not perform powder sample preparation in the electron microscope room, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to choose the application field of the two-dimensional microscope
The two-dimensional microscope has applications in many fields. The following factors can be considered when selecting its application field: ** 1. Industrial field ** 1. ** In terms of precision manufacturing ** - If it involves the production and processing of precision small parts such as machinery, electronics, aerospace, molds, springs, gears, terminal blocks, circuit board contacts, etc., the two-dimensional microscope can be used to detect the size accuracy and shape error of the parts. For example, in mechanical manufacturing, for some high-precision gear processing, the two-dimensional microscope could accurately measure parameters such as tooth shape and pitch to ensure that they met the design requirements. - In the metal and plastic, magnetic materials, electronic circuits, components, watches, hardware stamping industry and other industries, the two-dimensional microscope can be used for quality inspection. It can detect microscopic defects, scratches, size deviation, etc. on the surface of the product to ensure product quality. 2. ** In terms of product development ** - During the development of new products, the two-dimensional microscope could be used to accurately measure and analyze newly designed two-dimensional structures. For example, in the new design of electronic components, the two-dimensional microscope could be used to observe whether the two-dimensional structure layout of the component was reasonable, and whether the size relationship between the various parts met the design expectations, which would help to adjust the design plan in time. 3. ** Two-dimensional copying ** - For some situations where data copying and imitation of existing two-dimensional products were needed, the two-dimensional microscope could accurately obtain the size of the product. For example, in some mold manufacturing companies, when they needed to imitate foreign advanced molds, the two-dimensional microscope could help accurately copy the two-dimensional key size of the mold and provide data support for imitation. ** 2. Other Domains ** 1. ** Mining and archaeological aspects ** - Although it was not the traditional main application field, in the work of geological engineers and cultural relics archaeologists, if they needed to analyze the two-dimensional microscopic structure of materials such as ores, or observe the two-dimensional microscopic traces on the surface of cultural relics to infer historical information, the two-dimensional microscope could provide some help. For example, observing the distribution of the crystal structure of the ore on a two-dimensional plane, or analyzing the tiny scratches, marks, and other two-dimensional microscopic features on the surface of the cultural relic to obtain more historical information. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Depth of field of scanner gun
The depth of field of the scanner gun referred to the farthest and closest distance that the scanner head could leave the surface of the bar code under the condition that reliable scanning could be guaranteed. This distance was also known as the effective working range of the scanner gun. It would change slightly according to the density and size of the scanned bar code. For example, when a scanner gun was scanning a 3-mile bar code, the nearest distance could be 3.81cm, and the farthest distance could be 13cm. When scanning a bar code beyond this value, the sensitivity would decrease. Different types of scanning guns had different depths of field. For example, the working distance of the CCD-based scanner was limited to 0 - 30cm (the latest production had effectively expanded to 60cm), the depth of field of the laser scanner was between 20 - 100 cm, and some special laser guns could reach a few feet when scanning large barcodes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Small depth of field photography
A small depth of field was one of the areas that the camera focused on. In small depth of field photography, only a part of the picture is clearly shown, leaving the rest in a soft and blurred state. Generally, the soft and blurred part can be used as the background, often used to shoot portraits to highlight the main body and hint at the emotional state of the character. The method to take a photo with a small depth of field was as follows: 1. Using a large aperture to control the depth of field was a very convenient control method. Through a large aperture, unnecessary environments could be blurred, but attention should be paid to avoid the image becoming flat due to the blurring of the background. You could choose an environment with a background to shoot. Using a large aperture to blur the background and background to highlight the main body and enhance the sense of space in the picture. 2. Get as close to the subject as possible. 3. Turn on peak focus (especially important for manual lenses). 4. The surface being photographed should be as close as 90 degrees to the axis of the lens to expand the clear range. 5. Try to minimize the back and forth movement of the camera and the subject. There was a depth of field F value (F1.4 to F16) in the iPhone camera control. This value would affect the background blurring. The smaller the value (such as F1.4), the more blurred the background would be. It could be operated in photo mode but not in video mode. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Huawei depth of field camera
From the reference materials, it was only known that the Huawei nova 12i had a 2MP depth of field lens (f/2.4 aperture). More information about the Huawei depth of field camera could not be provided. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Depth-of-field production software
Some depth of field creation software included depth of field calculator, Google camera, Mix filter master, and so on. These software could meet the different depth-of-field requirements of users. For example, the depth of field calculator could calculate the depth of field of different cameras by aperture coefficient, object distance, and diameter of the circle of dispersion and support chart display; software such as Google camera and Mix filter master could take photos with real depth of field without adding masks or blurring range with a brush, which was more convenient to use. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Big depth of field classic
A large depth of field meant that the photo had a large vertical range of clarity. There was a relatively large range of scenery in front of and behind the focal point. A photo with a large depth of field would make the scene appear more spacious and magnificent. He often used a large depth of field when shooting large scenes. For example, when shooting mountains, oceans, and other grand natural landscapes, a large depth of field effect was needed to make the image clear from the nearby scenery to the distant horizon. To obtain a large depth of field, you need to control several elements: the aperture is small, such as F8, F11 and other smaller apertures when shooting scenery; the focal length is short, usually using a wide-angle lens; the object distance is long, and the focal distance is relatively far when shooting. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Super depth of field technology
Super depth of field technology has different applications in different fields: - In the field of photography, ultra-depth macro was a form of photography that used a specialized ultra-short focal length lens. - In the field of microscopes, ultra-depth of field technology was widely used. For example, the working principle of the three-dimensional super-depth microscope was based on the principle of light interference. By controlling the laser beam, different interference phenomena were produced in samples at different depths, so as to obtain the distribution and shape information of the samples at the corresponding depths, thus achieving the effect of three-dimensional imaging. There was also a large depth of field 3D microscope that used super depth of field imaging technology to achieve true three-dimensional microscopic imaging. The ultra-depth-of-field digital microscope uses ultra-depth-of-field technology, which can maintain a clear focus of the observed object within a certain range. By taking images of different focal points multiple times and combining these images using image processing algorithms, the clear focus of the entire object can be obtained. When observing non-planar objects, it has more advantages than traditional microscopes. It can provide clearer and more detailed microscopic observation images. It is widely used in biology, medicine, materials science, manufacturing, and other fields. - In terms of image synthesis, the super depth of field synthesis technology could better solve the problem of observing the work piece with height difference. It synthesized multiple images with different focus, and could observe the clear image of different focal planes at the same time, thus achieving the effect of super depth of field. Its core technology was multi-focus image fusion. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which novel is the depth of the field
"The Old Story of the Qing Dynasty" was an ancient romance novel written by Miss Qing. It told the story of being reborn in the Qing Dynasty. Some people loved it, while others hated it. "Unlocked Autumn" was an ancient romance novel written by Qing Qingdai. It told the story of a city girl who traveled to ancient times and wanted to accompany her intimate musician. However, she was appreciated by Kangxi and was involved in the battle for the throne. Since that's the case, then let's see how I fight. For love, for freedom, women should be strong. Hence, there was this-- The key words of this story were Liu Xinchen, Mo Yuan (Dezhao), and the prosperous Kangxi era. "Qingchuan's Youqing" was an ancient romance novel written by the author, Boulder Heart in the City of Brisk. It told the story of Shu Youqing transmigrating to the Kangxi Dynasty and becoming the cold palace concubine Shu Mulu Youqing. Following her transmigration was a half-crippled system. The system had a farm that ensured that she did not have to worry about food and clothing. However, the original body was weak. If she wanted to have a healthy body, she needed the system to be healthy. The system had lost a part of it because Youqing had transmigrated. That part happened to fall on Kangxi, causing him to see ghosts whenever he touched a woman. Later, Kang Xi accidentally learned from a female ghost that there was a promise in Jingyang Palace that ghosts could not get close to her, so he began to approach her deliberately. [PS: The male protagonist has not touched other women since the female protagonist transmigrated. The character information is: Youqing is the female protagonist, Kangxi is the male protagonist, and Kang Xi is the female protagonist.] "Drunken Breeze" was an ancient romance novel written by Ye Zi. It told the story of a fleeting glimpse at the age of ten that created a lifetime of love and entanglement. Fu Heng was like the stars in the sky. Sometimes, he was within reach, and sometimes, he was aloof. He never spoke of his love easily, but he always placed her in the deepest part of his heart. Ji Yun was a famous talent in the Qing Dynasty. He was passionate and dared to love and hate. He knew that true love could only be met by chance and not sought after. Once he met it, he would never let go. She, with her golden branches and jade leaves, wandered among the people, lost in his tender feelings like water, but when all the flowers fell, she realized that everything was just the moon in the water, the flower in the mirror. She was unwilling to give up on a period that was engraved in her heart. She did not want to. Being plain and simple was true happiness. The Buddha said that the past life of thousands of times in exchange for this life of brushing shoulders. In that life, turning mountains, turning rivers, turning pagodas, not to cultivate the next life, but to meet you on the way. It was the sister chapter of "I'll Allow You to Live Another Life." It was the story of Yongzheng and Ruohan's daughter. The key words of this story were: Qianlong Dynasty, Shen Zhuoya, Fu Heng, Ji Xiaolan. "Zhangqing" was an ancient romance novel written by the author Lei Dewen. It told the story of a modern mature woman, Qing Yu, who accidentally traveled to the Qing Dynasty and saw how an ordinary concubine's daughter became an empress after eight months in the palace. The overall review of this book was: Leidewen's new work, recommended, fattening up.| The life of the most honorable woman in the Qing Dynasty?| Da Da's new book is clear and clean ~ The quality of the pit is guaranteed, and everyone is welcome to jump into the pit ~| The "complete version" had a clear background, but it was a parallel world that was not exactly the same. Looking forward to the female protagonist growing up step by step, taking control of power and changing the history of later generations.| As the female protagonist of the modern Cao, she had transmigrated to the bed of Emperor Xianfeng and became the future Empress Dowager of the Eastern Palace, Ci An. The heroine used the crystallization of her past life to accompany Emperor Xianfeng through the treacherous political storm of the late Qing Dynasty.| This author's Qing Dynasty novels were awesome!| In fact, he did not like to read this part of history. It was too heavy and sad! However, reading Big Boss's introduction might change the ending, so he mustered up the courage to read it! At the moment, it was still very good to watch. It was a very special perspective!| News from an old author. I prefer this author's works. They are relaxed and logical. They are not white or Mary Sue. They are works of conscience.| Different clothes. As the personnel manager of the palace, it gives you a different feeling.| Modern white-collar workers traveled back to the Xianfeng period of the Qing Dynasty and were selected together with Cixi, a beautiful woman of the same period. Let's see how modern mature women played with Cixi and changed history. It was the latest work of a great author, and it was worth reading.| Supporting the new book! Because I really like this author.| This is the new work of the Great God, transmigrated in the late Qing Dynasty. Let's see how the Great God helped Xianfeng to abuse Prince Gong.| I've read two of the author's books before. This is the third one. It's the kind of slow story ~ It's about the history of the late Qing Dynasty. The female protagonist doesn't have a cheat code ~ Yes, it can adjust one's mood ~ It won't have big ups and downs, it's very comfortable ~ Although it's not fat, it can be used as a daily snack ~??| It was the work of a great author who habitually wore the same outfit.| It's another masterpiece. It's the first time I've seen such a perspective…|Leidewen's product, worth owning| The Almighty's latest work, see what kind of person the legendary Empress Dowager Ci 'an in history will be shaped into, see how Lang Qingyu transformed into Niu Gulu Qingyu and how she turned the world upside down in the Qing Dynasty.| The new works of the great gods are praised and demoted. Must Read Index:| She liked the stories told by the author, as well as the daily family gossip in the author's story.| Qing Yu, the modern mature woman, had no intention of transmigrating to become Xianfeng's successor, Qing Yu. She was selected at the same time as the future Empress Dowager Cixi. She wanted to see how an ordinary Manchu concubine's daughter could enter the palace as a concubine for eight months and become an empress under the strange political form of the late Qing Dynasty. Helping Xianfeng to turn the tide| I have to say, Qidian's mobile app is really awesome. I don't know what kind of deal it is, but it's true. Also…don't rebel, don't put an electric drill in your ass.| Immortal grass, can't bear to fatten up before looking Qingchuan looked the most comfortable. He didn't tell stories for the sake of stories. There was such a human smell. Finally, it was no longer limited to fighting for the throne. Anding elegant, eloquent. I'm not going to talk about it if I'm a joker.| If you don't know how to write a recommendation, look at the introduction!| I've read a few of the author's books, and I like them.| Although I don't really like the theme of Qing Chao (because there are too many Qing Chao theme in a certain period), I really like the books written by Xiao P. Speaking of which, when I saw Little P mention that there was an "acquaintance" in this set, I realized that the protagonist of the previous book was actually "him"~ haha| Even though the book written by Boss wasn't very interesting and didn't have many magnificent scenes, his three views were extremely correct. The plot was often set up unexpectedly and updated according to the points. It was very good.| It was to see what Little P's female lead was doing every day, to see if Little P's work was going well, and what she was busy with?| The author has read several books and likes them very much.| New book, author's bad taste can be followed ~| Lil 'p's works have always been like a chatterbox, and I really like her style. In addition, many of the readers have been too impetuous recently. I support Lil' p in creating a reading list.| Ranking index: (Not finished, worth looking forward to) Could she, who had transmigrated and dressed as Ci An, change the history of the late Qing Dynasty? They would wait and see. PS: There are a lot of descriptions of food in the entire article. You might be hungry at any time?| It's pretty good. I like this kind of calm female lead.| I like Xiao P the most, rational, indifferent| A new work by a great god, guaranteed quality, trustworthy writing style, and the female protagonist is not brainless.| Every story of leidewen is good| It wasn't particularly novel, but its intelligence had already beaten many of the Rebirth Vengeance Palace Fighters.| Poochie's works were deep and had a deep analysis of human nature ~| Little P's new novel was as good as ever. The theme was to change an unhappy history and reduce the pain. The female lead was working hard...| He had just read the female channel's novel, and it could be seen how much the book shortage had reached. She's the third female author I've read after Fu Tian and Yan Jiu. She has three types of works and three different feelings. She's also finished quite a few of her works. Her character must be guaranteed.| If you are willing to fight alongside the characters in the novel and take risks together, if you can subconsciously see the characters 'gestures, voices, and smiles in front of your eyes like watching a movie, then from my personal point of view, such a work will shine because the characters portrayed are alive, and will receive widespread attention because the characters outlined have left a deep impression on the readers.| My favorite author, big book, following the author to read, always has a different experience. I don't know what others think, I just think I like this style very much. Everyone's point of view is different, there is always a different point of entry, it is refreshing| What was it like to choose a concubine with Empress Dowager Cixi? Was he excited just thinking about it?| An alternative work in plain clothes, high IQ and not annoying, good looking| Don't ask me why a man would read a female novel. I've casually flipped through the book and read quite a few types of novels. This one is quite well written. I've seen the big picture from a small one. I'm slowly explaining.| Another type of book that could penetrate the void was worth reading!| Little P's book is really good. I like it!| I'm not interested in a book that's clean. He only put it in because this book review section was really, hehe. I've reported many of the comments, but Qidian didn't give any feedback. 17.11.29 input single If you like it, please like it and support it.| It was a different style of writing. It only had a sense of responsibility and no palace fights.| Leidewen's book was very interesting. There were no ups and downs in the plot. It was as if it was just a record of the days that were like water. However, it was between the lines that you would be unknowingly moved by her. It wasn't thrilling, but just like what she wrote in her book, she slowly accepted it through the change in the taste of the food.| It had been many years since he had seen the passage, but this was a clear stream of light in the passage. <️️<<p></p️>️| I don't know how to evaluate this book. If it doesn't jump up in the later stages, it will definitely be a good book.| This book was quite interesting, and she really wanted to see what the ending was!| It was a very good novel. PS: The novel is just a medium for the author to realize his ambition. There is really no need to escalate it to the point of national conflict.| Each chapter looked ordinary, but it was quite interesting when he thought about it. Of course, I couldn't forget the author's nagging at the end of each chapter, although I never understood what he was talking about.| In a novel that was reborn to the Qing Dynasty, the protagonist was reborn in the body of the Yeherala family and became the Empress Dowager. The story was very good, and he also liked novels that read clearly.| Because of the constant controversy, the author's writing was awesome! If I can borrow a phrase to describe my feelings, it would be that although the world is difficult, it is not hopeless. The author's update speed was also amazing. It felt like he was updating at midnight every day. And what I like the most is that the author has something to say! Hahahahaha! There was a chapter that a reader had replied to and named it as a gossip recommendation-Scumbag Senior Brother, I watched coldly from the side all those years! I burst out laughing as I watched! Also, the author's name is actually from the Pinyin of Lei's text. Hahaha, I thought it was an English name. I checked for a long time (*^o^*) In short, it was worth collecting! The end?| It was recommended. It was a rare Xianfeng novel in the female channel. The female protagonist traveled through time and was set to be a very magnanimous female protagonist. The plot was not small, but she was not impatient. She did not say that she wanted to change into Cixi or fight with Zhen Huan in the palace or anything else. There was an inner palace and a previous dynasty. When watching it, one did not have to look into the real historical details. It was quite good. The male lead was not a psychopath or the kind who only had love in his heart.| <<<recommendation index: >> Leidewen's book always had some simple life philosophy. It was a very special and enjoyable book. Was it worth reading?| A unique style of dress, no palace fights, no tears, working together to change the era| Ranking index **** A Different Qing Dynasty. The writing style was good, and the storyline was okay. Those who liked to take history seriously should not read it. I like this kind of domineering and wise female lead. I didn't expect to see the end today (May 9, 2018). It was a good book.| I stumbled upon this book by chance and read a hundred chapters in a day. The author is knowledgeable in history and has a good writing style. It's about how a modern woman traveled to a parallel space during the Xianfeng period of the Qing Dynasty. She became an empress step by step and assisted Xianfeng in governing the country.| This is a very good book. I strongly recommend it.| Empress Dowager Ci 'an is in charge of the Legend of Qing. She looks quite happy.| I don't know when this book was added to my reading list. An old-fashioned romance novel won with delicate emotional passages and brain-burning plots. Overall, as a male reader, it was still acceptable. The only flaw was that the story had some routines. Women with a Qing Dynasty background should be self-reliant? Most of the ancient words were about romance in the ancient style, which had some relationship with the ancient language, but not much. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Depth of field and blurring data analysis
The depth of field referred to the clear range before and after the camera was focused. The image elements within the range were clearly visible, and the outside of the range was a gradual blurring effect. The depth of field was closely related to blurring. The main factors were as follows: ###1. The size of the camera film The larger the film, the better the blurring effect. This was one of the reasons why full-frame cameras were popular. ###2. Distance between camera and target 1. ** Close Range **: The closer the camera is to the target, the better the background blurring effect. However, in macro photography, you need to pay attention to reducing the aperture to obtain a satisfactory clear range. 2. [When the target is far away from the background, even a relatively small aperture like f5.6 can have a good blurring effect.] ###3. Aperture size 1. [Generally speaking, the larger the aperture, the better the void-ification effect.] 2. ** Special circumstances **: When the aperture reaches a certain level, such as f1.2 and f1.0, the difference is mainly in the amount of light passing through. The difference in production cost is large, but the difference in blurring effect is small. There is no need to pursue a large aperture. ###4. Focus length 1. ** Telephoto lens **: The longer the focal length, the better the blurring effect. The degree of background blurring is better than that of a short focal length lens. It is better to choose a focal length of 135mm or above. For example, a 240mm telephoto lens can achieve a blurring effect close to 135mm/F1.8. A telephoto lens can blur the background and highlight the main body in scenes such as portrait photography. 2. ** Wide-angle lens **: Wide-angle lens has a large depth of field and limited blurring ability. ###5. Depth-of-field and blurring in mobile phones 1. ** The role of computational photography **: Some phones, such as the FindX7 Ultra, have a dual periscope telephoto design. When taking photos at 3x, the 6x lens can calculate the depth of field blurring to achieve a more natural depth of field blurring effect. 2. ** Depth-of-field effect on shooting effects **: - ** Depth of Field (Small Depth of Field)**: The clear range is small. Other than the main body, the other picture elements are outside the depth of field. The background is blurred and the picture is simple. It can highlight the main body. It is often used for animal, plant, and portrait photography. - ** Depth of Field (Large Depth-of-Field)**: Large range of clarity. The main body and other picture elements are within the depth of field. The entire picture is clear and clear. It is often used for group photos, meetings, events, landscape photography, and other scenes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>