The relationship between lens parameters and imaging
Many parameters of the lens were closely related to the image. ** 1. In terms of resolution ** The resolution restricted the ability of the lens to distinguish the details of the captured scene. The unit was "line pairs/millimeter", and the limiting factor was the phenomenon of light refraction. ** 2. Aperture ** 1. Generally speaking, the size of the aperture affected the amount of light entering. The F value represented the size of the aperture. The smaller the F value, the larger the aperture, and the greater the amount of light entering. For example, in a driving recorder, the aperture size was directly related to the imaging effect at night. When the light was dim, a large aperture (small F value) meant better imaging effect. 2. In the camera lens, different aperture values combined with other camera parameters could meet different shooting needs. For example, a large aperture (small F value) could produce a shallow depth of field effect, making the background blur and highlight the main body. For example, the F1.4 aperture in the SIGMAR fixed-focus lens could give the picture a very good depth of field effect; while a small aperture (large F value) had a large depth of field, which could make the near and far scene relatively clear. ** 3. MTF value (module transfer function)** 1. The MTF value was a comprehensive evaluation of the sharpness, contrast, and resolution of the lens. It was an evaluation of the overall resolution. It was an authoritative and objective technical reference for the quality of the lens. 2. Using Canon's MTF image as an example, the horizontal axis represented the radius of the imaging plane from the center to the edge, and the vertical axis represented the percentage of the imaging quality reaching the physical condition. The black line in the thick line represents the resolution test result at the maximum aperture, the blue line represents the test result at the F8 aperture, the solid line represents the MTF value in the radius, and the dotted line represents the MTF value in the tangency. An MTF value above 0.8 meant that the lens 'performance was in the excellent range, but a lens with an MTF value below 0.6 at the center of the circle was definitely not a good lens. However, it was important to note that MTF charts could not be used to compare lenses with different focal lengths, different frames, fixed focus, and zooming. It was also impossible to compare MTF charts of lenses from different manufacturers under the same focal length because the testing conditions of each manufacturer were different. ** 4. The distance between the two sides of the lens and the inner diameter of the bayonet (affects the compatibility between the lens and the camera and thus indirectly affects the image)** 1. The distance between the two sides was the distance between the bayonet and the plane where the LCD was located. The inner diameter of the bayonet was the diameter of the inner edge of the circular bayonet. The fundamental reason why the lenses of different brands of cameras could not be used in the same way was that the distance between the bayonet and the collar was different. 2. A camera with a short flange-distance could use the lens of a camera with a long flange-distance (the flange-distance could be extended by the transfer ring), but a camera with a long flange-distance could not use the lens of a camera with a short flange-distance. The trend was to use a shorter distance and a larger bayonet diameter, such as Nikon and Canon's new bayonet design. ** 5. Other aspects ** Aspherical lenses and large depth of field were two technical indicators that would also affect the imaging effect of the machine vision lens. In the actual use of the camera, such as the selection of live broadcast equipment, the selection of different lenses (such as the original camera lens and the Vicos fixed-focus lens) would present different imaging texture and depth of field effects. Read more exciting novels for free
Canon photography award
The following is an appreciation of some Canon photography works: In Canon's full-frame photography competition, for example, the author Ruan Rongqiang used Canon's Eos5D Mark IV to shoot his work " Sprout." The photo highlighted the ability to capture the moment. The bird stretched its wings to capture the moment. The focus was clear and accurate. The details of the leaves and bird feathers could be seen. The composition showed a lively state. In the Canon Canon - The first prize winner was the work " The Secret Realm of Ice ", which was equipped with the Canon Eos 5D Mark IV. In the picture, a person was standing in front of a huge glacier, surrounded by glaciers and the starry sky. The person was attracted by the spectacular scene, and the overall picture gave people a sense of tranquility and contemplation. - The second-prize work, Starry Tale in the Cold Night, was equipped with the Canon Eos R5. It showed the quiet night scene of meteors streaking across the night sky, trees covered in snow, and spectacular rime. The light of the meteors formed a sharp contrast with the starry sky and trees, adding a sense of mystery. - The third-prize work, Ice Cave, although the equipment was a Nikon D750, it also showed a unique ice cave landscape. Through the details of the scenery and the light and shadow, it presented the rich layers of ice and snow. There were also many excellent works in Canon's " Sharing the Beauty of Eco " photography competition. These works showed the photographer's ability to capture various elements such as nature, people, and cities from different angles, reflecting the advantages of Canon cameras in recording wonderful moments. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A novel with the female lead named Shen Ruyan
He recommended a few good novels. Nan Qingkong, the author of "Jiao Yi Nan Nan", was an ancient love story that crossed the strange love category. The female protagonist, Shen Qin, was 18 years old and knew both Chinese and Western medicine. She was both sweet and salty, and she wanted to live a good life. The male protagonist, Zhong Yunshu, was 22 years old. He was a genius in solving cases. In fact, he was a sweet and black-bellied man. The supporting roles also had their own characteristics. He's good at writing, but he's not poisonous. The author of " Shen Family's Eldest Daughter " was always seeing peach blossoms. It was an ancient romance, business, and farming. As the eldest daughter, Shen Qing Yu supported the home of her weak parents and younger sister. Jun Ruo Qingyan, the author of " The Eldest Daughter of the Reborn Family ", was a modern romance. Su Weiyu became the richest man after her rebirth and finally got married to Shen Yihan. Lu Qingyi, author of " The Real Rich Girl Is Studying Again ", modern romance and urban life genre. Shen Qingtang dressed up as the unfavored real rich girl and worked hard to learn to turn things around. Shen Yue, the author of " 80's Good Wife ", was a modern romance and love story. The female protagonist traveled back in time to become a farmer's daughter in the 1980s to become rich. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
" The cannon fodder cub became the team pet after being paid."
Based on the current information, he only knew that " The cannon fodder cub became the group's pet after being paid " was a web novel. The author was Qie You, but there was no more detailed information about the content and plot of the novel.
The stars broken by the mulberry tree
Sang Zhi's broken stars contained her secret love for Duan Zhengfeng. When Sang Zhi was still underage, she had written her teenage thoughts on a piece of paper that folded the stars, such as " Although I didn't want to admit it, I had already fallen in love with you before I knew the three words that corresponded to your name." Later, she put the star in a red envelope and gave it to Duan Zhengfeng. The star wrote "Brother Zhengfeng, Happy New Year". This scene showed Sang Zhi's delicate and pure emotions, and the star also became her emotional sustenance. While waiting for the TV series, he could also read the exciting content related to this site!
Guo Muying's personal background
Guo Muying, formerly known as Guo Muying, female, Han, born in Heilongjiang Province, the mainland of China model. In 2007, she entered the human model industry and worked as a model in the photography works "Silk Show","Silk","Beauty's Health" and "Little Witch". While waiting for the TV series, he could also read the exciting content related to this site!
The Reborn Emperor Ling Tian's novel
Currently, the main character of the novel " Reborn Emperor Ling Tian " was known to be Ling Tian. Ling Tian, who had graduated from university, went to the border to work due to his poor family background. During the flight, he encountered a drastic change in the world and struggled to lie in the ancient bronze coffin. He was pulled into the cultivation world by the nine divine dragons and began an unusual life journey. On the road of cultivation, he experienced all kinds of emotions, killing all gods and buddhas along the way, and finally became the first generation Emperor Ling Tian. In addition, he was originally the young master of a branch in a remote area of the Heavenly Martial Continent. He was humiliated because he could not awaken his Martial Soul on time. Then, he started his story by practicing strange skills, exploring dangerous places, obtaining strange treasures, and fighting against Heaven's Favorites. The book's chapter index included chapter 1, Rebirth, chapter 2, Ling Shiya, and other content. Click on the link below to read the manga "The Most Powerful Sect in All Time"
Love until the spring tide rolls
The music video for "Love Until the Spring Tide Rolls Over" was a music video for the advertisement of Spring. The music video had the artistic temperament of ancient China. The male lead was Li Dongxue (played by Guo Junwang) and the female lead was Huang Shengyi. There were no lines in the entire MV. It was full of Xianxia style, elegant and agile. The music video included scenes of a Jianghu couple living in seclusion in a bamboo forest, drinking together in the green mountains and clear water. The song of the same name in the film,"Wuliang's spring light is brilliant, and the fragrance has drunk the world for three thousand years." It pointed out the brand concept of Wuliang, and it was catchy. The entire music video used green and dark colors, such as the sea of bamboo and deep forests. It had a hazy feeling. Handsome men and beautiful women dressed in green clothes, holding red umbrellas in the bamboo forest, looking at each other affectionately in the bamboo pavilion, drinking, and other scenes were very beautiful. This music video was like a well-made music video with beautiful pictures and beautiful songs. It was once popular all over the country and became a classic among alcohol advertising music videos. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The pose of a single-lens reflex photographer
When shooting with a single-lens reflex camera, there were several poses: 1. When shooting small objects or potted plants, you can use a tripod to hold the camera. 2. When taking pictures of small insects or plants on the ground, you can take pictures in a prone position, so that the pictures taken are large and not blurred. 3. When taking pictures of trees with lush branches and leaves, you can bend your back slightly into a bow and hold the camera with both hands to take pictures. 4. When taking artistic or landscape photos, you can keep your body upright, hold the camera with both hands, and place it over your eyes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The incisive insight into the origin of Transformers
The movie " Transformers: Origins " had a rich content. It was not only a supplement to the story of the 86 Transformers, but also an in-depth exploration of the origin and transformation of the two characters. From the perspective of the characters, Pikes and D - 16 could have been good friends for life, but the twist of fate led them to different paths. Pikes was full of rebellious spirit. At first, he seemed like a rebel, but deep down, he valued friendship and the interests of the team. This trait made him become the pillar of support after a series of events. D - 16 was originally calm and self-restrained, but due to the collapse of his faith, he went to the extreme after suffering a huge psychological shock and became Megatron. This showed the complex changes in the character's personality and beliefs under different situations. In the movie, Cyberton was not as calm as it seemed. The betrayal of Sentinel revealed the dark truth hidden under the seemingly beautiful appearance. This kind of plot setting deepened the depth and layering of the story, making the audience realize that in the world of Transformers, the boundary between heroes and villains was not always clear. There might be complicated reasons behind it. In addition, the concept of " one " was used throughout. It was not only understood by the China publishing party as " origin," but also meant unity. It was one of the key factors in the formation of the characters of Prime and Megatron. The entire movie was filled with thoughts on topics such as friendship, faith, justice, and evil. It evoked the audience's childhood memories and gave the audience a new and deeper understanding of the world of Transformers. " Transformers: Origins " was not enough. Everyone, please click to read the novel!
What's the use of a construction site springboard?
On a construction site, a springboard was a construction tool. The springboards were divided into steel springboards and wooden springboards. The steel springboard could be used to construct the platform. It had bolt holes for connecting the boards to adjust the width of the bottom of the platform. The boards were fixed with skirting boards. After the connection between the steel springboards was completed, the materials used to make the platform had to be strictly inspected. After the platform was completed, it had to be tested, installed, and inspected before it could be put into use. It could withstand many people standing without being deformed, and was sturdy and durable. The surface of the board had protruding holes to prevent slipping and sand accumulation. Its unique shape design was easy to bundle, hang, and install. It was easy to stack neatly when idle, which was beneficial to on-site management. The wooden springboard was a facility for people to walk around, operate, and place tools and materials during construction. The processing process was exquisite. These springboards provided the construction workers with a flat surface to work on and pass through during the construction process, which was helpful for the construction of various operations. While watching the Olympics, you can also read the wonderful novels related to the Olympics!