The lens parameters are good or bad
The judgment of lens parameters mainly involved the following aspects: ** 1. Focus related ** 1. ** Fixed focus and zooming ** - The focal length of the fixed-focus lens was fixed (such as 50mm) and had a fixed shooting angle. Fixed focus lenses often had certain advantages in terms of optical performance, and the image quality might be better. - The focal length of the zoom lens was variable (such as 24 - 70mm), and the shooting angle could be changed by adjusting the lens. It was convenient, but at the same price, it might be slightly inferior to a fixed-focus lens in terms of image quality. 2. ** Relationship between angle of view and focal length (for the same camera)** - The larger the focal length number, the smaller the angle of view. It could enlarge the distant scene, suitable for close-up, long-distance or telephoto shooting scenes, such as shooting sports, birds, and so on. - The smaller the focal length, the wider the angle of view, allowing the picture to contain more information. It was suitable for shooting scenes that required a deep sense of depth, such as culture and vlogs. However, the quality of the lens could not be judged solely based on the focal length range. For example, the 18 - 200mm lens covered a larger focal length range than the 18 - 135mm lens, but it could not be directly considered that the 18 - 200mm lens was better. 3. ** equivalent focal length (different camera format)** - Lenses with the same focal length had different angles of view on different camera frames. In order to facilitate comparison, the concepts of equivalent coefficient and equivalent focal length (equivalent focal length = focal length × equivalent coefficient) were introduced. When different frame cameras were equipped with the same focal length lens, the effect of the equivalent focal length on the shooting angle needed to be considered. ** 2. Aperture related ** 1. ** Aperture size indicates ** - The maximum aperture of the lens could be written in many ways, such as 1:2.8, f/2.8, and F2.8. The smaller the number, the larger the aperture, and the larger the number, the smaller the aperture (such as F1.4>F2.8>F4). 2. ** Impact on the virtual reality and depth of field of the image ** - For the same camera and the same focal length, the larger the aperture, the shorter the depth of field. In portraits and still life shots, it was easier to blur the background and highlight the subject. - A large aperture could help increase the shutter speed, help to freeze high-speed moving subjects or improve the success rate of hand-held shooting in low-light environments, but a large aperture lens did not necessarily have better image quality. 3. ** Aperture in a zoom lens ** - If the focal length of the zoom lens is 1 number (such as F2.8), it means that it can reach F2.8 aperture (constant aperture) over the entire focal length range; if the lens aperture is 2 numbers (such as F3.5 - 5.6), it means that during the zooming process, the maximum aperture of the lens will change (floating aperture). Generally speaking, a constant aperture lens was more expensive than a floating aperture lens. ** 3. MTF value (module transfer function)** 1. ** Meaning ** - The MTF value was a comprehensive evaluation of the sharpness, contrast, and resolution of the lens, which was also an evaluation of the overall resolution. 2. ** Value interpretation ** - An MTF value of 0.8 or above meant that the lens 'performance had entered the "excellent range," but it was not necessarily a good lens overall. If the MTF value at the center of the circle was less than 0.6, it was definitely not a good lens. However, it should be noted that MTF charts should not be used to compare lenses with different focal lengths, different frames, fixed focus, and zooming lenses, nor should MTF charts be used to compare lenses from different manufacturers under the same focal length. This was because MTF charts published by various manufacturers were obtained under different test conditions and were not comparable. Read more exciting novels for free
I just want to cultivate a fairy novel and read it for free
Here are some recommendations for immortal cultivation novels: - "Evilwind": It has a unique plot and style in immortal cultivation novels. - [The Rebel Immortal: A cultivation novel that is deeply loved by readers.] - [Mortal Cultivation Biography]: Pioneers the path of mortal cultivation and narrates the arduous cultivation journey of an ordinary youth, Han Li, who relied on his own hard work and wisdom. - "Journey to the Future" was ranked at the top of many recommended immortal cultivation novels. - Buddha Is the Way, a classic immortal cultivation novel. - [One Thought for Eternity]: The plot is fascinating. - Once Upon a Time, There Was a Spirit Sword Mountain had a unique story setting. - [My Senior Brother is Really Too Stable]: The story was more exciting. - " Covering the Sky " had a grand world view and a rich plot. - " Road to Immortality ": It was a mortal novel. The main character, Zhao Linggen, had poor aptitude. He relied on the Cauldron of Heaven and Earth to embark on the path of immortality and reach the peak. After that, he gave up his cultivation reincarnation to save the immortal world. - " Great Demon Psychic ": A classical immortal cultivation genre. The protagonist transformed from an ordinary youth into a great demon and stepped onto the path of immortality. There are strange demon beast settings in the book. - [Cyan Emperor]: A fairy tale about luck. After the protagonist is reborn, he takes advantage of the opportunity to achieve the name of Cyan Emperor. - " Heavenly Official of Blessing ": A mythical cultivation novel similar to incense becoming a god. The protagonist was born in a special way and gradually walked the path of a great god. - " After Becoming a Taoist Doctor ": A classic immortal cultivation genre. The protagonist transmigrated and merged the Chinese medicine and Taoist systems to become a Taoist doctor and open the path of immortal cultivation. - [Fight Through the Heavens]: The main character Xiao Yan's counter-attacks and face-slapping along the way set off a craze for breaking off the engagement and the rise of a good-for-nothing. - Sword Snow Stride ": Construct a world of Jianghu with flesh and blood. Xu Fengnian's legendary path of Jianghu contains elements of immortal cultivation. - [Perfect World]: Shi Hao continuously overcame difficulties and obstacles during his growth. - The main character, Ye Chen, goes through hardships on the Immortal Martial Road and confronts his enemies fiercely. - [Legend of the Shepherd God]: The main character Qin Mu walked a different path of immortal cultivation. - Celestial Bane was also a classic among immortal cultivation novels. - The Supreme One: A novel that was considered excellent by some readers. - Lanke Chess Fate: A cultivation novel with unique plots and other aspects. - 'Stars Transformation', a cultivation novel that was highly praised by many readers. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What symptoms and reactions can hives usually have?
Urticaria is usually manifested by the sudden appearance of red raised patches or wheals on the skin, which can be accompanied by intense itching. Different types of hives had different symptoms: 1. acute hives: large patches of red spots suddenly appear on the skin, making it very itchy. In severe cases, it may be accompanied by palpitation, irritability, etc. The course of the disease generally does not exceed 6 weeks. 2. Artificial Urticaria: After scratching the skin, there will be clear red bumps on the scratched area, and the shape is like a whip. 3. Cholorgic hives: When you run, sweat, drink hot drinks, or are nervous, small wheals appear and are particularly itchy. 4. Cold hives: When the body comes into contact with cold water or cold wind, there will be patches of red spots, swelling and itching. 5. chronic spontaneous hives: spontaneous wheals and edema of blood vessels occur repeatedly for more than 6 weeks, with at least 2 episodes each time. The symptoms are relatively mild, and the number of wheals varies. 6. Inductive Urticaria: For example, scratching the skin with a hand or blunt object, a few minutes later, a strip of swelling along the scratch will appear; cold contact Urticaria will appear after contact with cold water and other cold objects. 7. Contact hives: wheals, red spots, and itching occur after skin contact with certain allergens. It can no longer occur after staying away from the allergens. 8. Allergy Urticaria: Most of them are caused by allergic mechanisms. Sometimes, there is a bruise in the center of the damage (it can be called bleeding allergic Urticaria, and the kidneys and stomach may bleed at the same time). When there are blisters, it is called vesicle allergic Urticaria. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What's the color temperature of the standard lighting for photography?
For daylight film, the standard equilibrium color temperature is 5500K, and for light color film, the standard equilibrium color temperature is 3200K. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Harry Potter 8 Complete Version
The eighth movie in the Harry Potter series was Harry Potter and the Deathly Hallows (Part 2)(2011), which told the story of Harry Potter's decisive battle with Voldemort in the Second World War of Witchcraft and Wizardry and the destruction of Voldemort. In addition, there was also Harry Potter and the Cursed Child, which was based on a new story by J. K Rowling, John Tiffany, and Jack Thorne. It was considered the eighth story in the Harry Potter series. It was a brand new script and was brought to the stage. Harry Potter and the Sorcerer's Stone was not enough. Everyone, please click to read the novel!
After the rebound, it will still go down
According to relevant market analysis, there was a possibility of a downward trend after the stock market rebounded. For example, some people believed that the current market was in the second wave rebound stage or there was a downward exploration. The index target range was 2900 - 3100, and they reminded investors that the market was fast-paced and fluctuated violently, so they should avoid chasing up and killing down. There were also examples that showed that after the stock price of Zhongke Shuguang almost doubled, although it still maintained a 60% rebound height, due to the huge profit margin, some institutions might choose to cash in part of the profits or seek more chips, and the stock price still had further downside risks. Therefore, judging from the overall situation of the market and the performance of individual stocks, it was possible to go down after the rebound. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A happy memory of my childhood
## My Happy Childhood Memory When I was a child, there was an extremely happy memory that I can't forget. One sunny day, my family went to the park. There were lush green trees and colorful flowers everywhere. I saw a small pond in the park, and there were many little fish swimming freely in it. I was so excited and eager to feed the fish. My father bought some fish food for me. I threw a little fish food into the pond at first, and then many fish swam towards it quickly. They were scrambling for the food, which made me laugh heartily. After that, we flew a kite on the large grassland in the park. My father held the kite high up, and I ran forward with the kite string in my hand. After several attempts, the kite finally flew into the sky. It was like a beautiful bird dancing in the blue sky. I looked at the kite flying higher and higher, and my heart was full of joy. That day was really a happy day in my childhood. I felt the warmth of my family and the beauty of nature, which left a very precious memory in my heart. ##My happy childhood memories When I was a child, there was a very happy memory that I couldn't forget. One sunny day, my family went to the park to play. The park was filled with lush green trees and colorful flowers. I saw a small pond in the park. There were many small fish swimming freely in the pond. I was so excited that I couldn't wait to feed the fish. Dad bought me some fish food. I threw some fish food into the pond first, and then many fish swam over quickly. They were fighting for food, which made me laugh. After that, we flew kites on the grass in the park. Dad held the kite high and I ran forward with the kite string in my hand. After a few attempts, the kite finally flew into the sky. It was like a beautiful bird dancing in the blue sky. I watched the kite fly higher and higher, and my heart was filled with joy. That day was truly a happy day in my childhood. I felt the warmth of my family and the beauty of nature, which left a very precious memory in my heart. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the expressions of a woman who has you in her heart?
What are the types of horror ghost novels?
There were a few common types of horror ghost novels: - ** Modern City **: This type of novel usually sets the ghost-catching plot in a modern urban setting, such as " My Years as Mr. Yin Yang ", which tells the story of the protagonist using Taoist techniques to solve supernatural events in a modern city. The book will involve the combination of modern urban life and traditional ghost-catching techniques, such as the supernatural phenomena in modern architecture, the entanglement of urban people and ghosts, etc. - ** Ancient Words **: The story is set in ancient times, such as " The Royal Palace of Flowers ". It is based on ancient social styles and cultural customs. It will unfold supernatural stories such as monster hunting. It may involve elements such as ancient monster hunting sects, supernatural events in the palace, or folklore. - ** Suspense-and-Reasoning Category **: Incorporate elements of suspense and reasoning into the ghost-catching plot. For example, there is a complicated conspiracy or truth hidden behind the supernatural events in the novel. The protagonist needs to solve the puzzle step by step through reasoning and ghost-catching methods. For example, some plots revolve around ancient curses and mysterious deaths. The protagonist keeps searching for the truth behind the ghost-catching process. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The novel where the protagonist travels through the other world and has the ability of the sword
The following are some recommendations for novels that have been completed and have the ability of a beheading knife: " Redemption from the Giant ", in which the protagonist transmigrated to the world of Death and had a strange beheading knife that strengthened the injured person;" The Secret Movement of Death ", in which the protagonist Xia Yan joined the secret mobile army in the world of Death and had a lightning-type beheading knife; The main character can copy the sword he has seen with his own eyes and store it in the intrinsic barrier. He will also have the Heaven's Wrath Sword. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
List of actors in The Story of Rose
The 2024 edition of The Story of Rose was led by Liu Yifei, Tong Dawei, Wan Qian, Lin Gengxin, Huo Jianhua, Lin Yi, Peng Guanying, Zhu Zhu and others. Chen Yao, Lan Yingying, Wu Bi and other actors also participated in the play. In addition, the 1986 edition of The Story of Rose was starred by Zhou Runfa and Maggie Zhang. The original work was equally exciting. You could click on the original work of " The Story of Rose " to understand the plot in advance!