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People have introduced the application and installation methods of large-format camera page-collecting film and 12 glue, and tomorrow we will learn about the most important department in large-format photography-lens. No photographic method can close the lens except for large-hole imaging. A lens with exquisite design, reasonable structure and moderate price can be put down. Because of the characteristics of its fuselage structure, large-format photography determines the simple deconstruction of the lens it needs. Please note that, outside the scope of professional photography, a good lens can't be judged by its high image power alone. The imaging cause of a photo is determined by the elements in a multi-circle, among which the clarity, anti-good, color and layer owner of the initial photo are determined by the lens group structure of the lens and the coating technology and production technology adopted, and the external fruit will also affect the final image failure. For example, meteorological conditions, atmospheric transparency, temperature, film type, and even a slight shock of tripod, etc.

The lens of a large-format camera is completely different from that of a 12/135 camera in terms of structure. Because the lens design of medium and small format cameras needs to ensure that the camera can focus and view correctly in strong light environment, a zoom lens with multi-lens group structure is developed for convenience of use, and factors such as small total area and large reduction ratio should be considered. Besides the paraxial camera, the lens of other SLR cameras should also consider the influence of mirror box and reflector on the focal length change of the lens when designing. Therefore, the lenses of medium and small format cameras have high brightness, high resolution and relatively simple lens group structure. However, for a large-format camera with adjustable axis, these problems are not so important, but the angle of view of the lens and the image circle range of the ultimate image are the most important. Because they decide that the photographer is the most ineffective day to display the shift effect provided by the large-format camera. The technical specifications of the lens can be divided into two types: front angle and back angle. The larger the front angle, the wider the viewing range, the larger the back angle and the larger the labyrinth of the image circle, and the characteristics of shifting the axis of the large-format camera can be displayed more vividly. However, the advantage that the resolution per unit area of large-format camera lens is lower than that of medium and small-format camera lens is finally supplemented by the upper hand of the bottom full area. With the continuous development of photographic equipment manufacturing technology, the lens quality of large-format cameras has become higher and higher in recent years. The lens' representation of color is more pure and the resolution is higher. In lens manufacturing, computers have been widely used to help design, which greatly slows down the development and manufacturing process. In addition, the application of the new multi-layer coating technology enhances the contrast effect of the lens, improves the dispersion of the edge light, reduces the deformation, and reduces the glare in the lens, making the level of the photo more abundant. By using APO (long chromatic aberration) lens, the color recovery is more realistic, and it has better resolution in the range of its lens image circle.

Due to the complexity and high cost of lens design, development and reduced production, many large-format camera manufacturers do not personally produce lenses or basically do not consider the problems of their own brand lenses. Euphemistically, camera users choose more practical lenses according to their own practical needs and situations. There are some very famous camera factories that only invite manufacturers who specially manufacture lenses to assist in research and production. SINAR Company of Switzerland, a manufacturer of large format phase mechanism, cooperated with RODENSTOCK Company of Germany to launch a series of excellent lenses specially designed for Sinar cameras. The world-famous Lin Hao large-format camera in Germany has also chosen RODENSTOCK in Germany and SCHNEIDER, which also belongs to Germany, to develop, design and manufacture lenses for it. At present, there are four major brands of large-format camera lenses which are well-known in the world and have a great influence on our domestic photographers, namely, Rodenstein (Sinalon) produced in Germany, Nicol (produced by NIKKOR Nikon) produced by Schneider and Fuji Long (produced by FUJINON Poor Company) produced in Japan. The professional lenses of these four brands are very different in the lens group structure. The focal length ranges from a super wide angle of 24mm to a super telephoto of 12mm, and the types are very rich, while the detailed technical specifications are different in style and have their own strengths. Because of the complicated structure, standardized operation and universal accessories of large-format cameras, people who like large-format photography can choose the most suitable lens for their own use among the lenses with a total number of more than 3 from these brands. There is never a brand of medium and small-format cameras in the world that can have so few excellent lenses for photographers to choose from. This unparalleled advantage is completely harmful to the openness of large-format cameras.

At present, domestic photography circles have paid much attention to Debon's optical technology and products, so the products of Rodenstein and Schneider are the most common lenses in the market. Rodenster Company is famous for its excellent moral character and high quality, and now it produces 7 different types of lenses with nearly 4 specifications, including the latest digital lens developed by the cooperative professional digital imaging system, with the focal length ranging from 28mm to 48 mm. For decades, the lenses produced by Rodenstein Company must have the characteristics of natural re-hidden color. Schneider Company has a history of producing large-format professional lenses for more than 9 years. At present, it produces more than 3 lenses in 7 important series (not including public lenses designated for special factories), ranging from super wide-angle lenses with a focal length of 38mm to short-focus lenses with a focal length of 8 mm.. Moreover, for all lenses, there can be different kinds of shutter drops for matching use.

The main advantage of large-format photography lies in the adjustability of photography. You need these professional lenses that can provide a large imaging range and excellent images to better complete this feature. In order to always walk behind the request of photography without continuous progress, designers with rich experience and tradition have been in the process of continuous development. These brands represent the most advanced lens production technology and technical standards of their predecessors, and they can provide you with the most suitable high-quality professional lenses.

Large-format camera lens (II)

As a household name, Debon lens is better than Japanese lens in color and level. As a result, in the field of large-format photography with higher requirements for color, gradation and coarse detail, German lenses are even more romantic. Although the NIKKOR and FUJINON lenses of Yeben also have indecent image power and color, because the technical specifications of most lenses are not obviously superior to those of German lenses, and the market price is far from or even higher than that of German lenses, people are more willing to use German optical technology to invent rich bright levels and coarse bright transitions. However, the Japanese original lens also has its own shortcomings. For example, the medium-and-low-focus lens of Sanke's lens is excellent, while similar ultra-low-focus lenses have been produced in Debon. Qiong Shilong has a medium-focus lens with a large studio, and the German lens can only look at its negative in this aspect. However, due to the long variety of these lenses, on the contrary, almost all German lenses can have poor imaging, so it is not enough to shake Germany's dominant position in the professional lens market in the world with only a few specialized night lenses. Therefore, our introduction has never been based on the German lens.

the most famous lens factory in Germany is the well-known RODENSTOCK company. The design of large-format lens has a long history, which is constantly changing because of its simple structure, and more is the improvement of coating. For telephoto and macro lenses, the "APO" design is adopted to effectively improve the edge dispersion. Not only that, but also when the design method is used in lens design with standard viewing angle specifications.

For decades, the lenses produced by Rodenstein's parent company must have the characteristics of real natural re-hidden color. Today's Rodenstein lens also adopts "APO" low color set process design, which can reduce the imaging scale and ensure the amount of photos in the first stream and the blur of the edge. In order to meet the ever-increasing demand for photography, Rodenstein lens with rich tradition has been trying its best to develop and discuss older products.

APO-SIRONAR-DIGITAL split lens is a fantasy lens to accompany you into the digital photography world. Because Rodens blames his parent company's efforts from time to time, you can still enjoy the unexpected high-quality consequences of this kind of lens that can degrade digital photography tomorrow. The focal length range is rich, with 35mm, 45mm, 55mm, 9mm, 15mm, 135mm, 15mm and 18mm. In 27, with the help of HR digital lens, which has no oldest participation, it is relatively a leader in the field of optical education in the world.

APO-GRANDAGON series is a small ultra-wide-angle lens suitable for taking large-format photos. Especially when the top film with the size of 69cm or 612cm is used, the best image restoration can be lost by shooting with the "APO" wide-angle lens with insufficient focal length in cooperation with large-format image technology. The back angle of the lens can reach 12, which can lose fresh and weak images. This series of lenses includes focal lengths of 35mm, 45mm and 55mm.

GRANDAGON-N series is a wide-angle lens used in narrow occasions. This kind of lens has a maximum back angle of 15, which is mainly used when shooting outdoor micro-scenery. Rodenster's wide-angle lens has the maximum aperture of F4.5, which is brighter than the scene, and makes the ultimate imaging brightness more uniform and the deformation smaller. The focal length covers the range of 65mm, 75mm, 9mm, 115mm and 155mm.

APO-SIRONAR-N, a typical multi-function lens, is used when shooting all kinds of products and things. Like Schneider, it adopts the classic deconstruction design of four groups and six films. Although the price is absolutely cheap, it still allows it to use the title of "APO" safely. The rear viewing angle of 72 can not only ensure the best quantity of photos, but also provide enough conditioning potential for the camera. This series of lenses has 135mm, 15mm, 18mm, 21mm, 24mm, 3mm and 36mm less focal length segments.

lenses such as Apo-Siron AR-S are not designed to meet the needs of lower requirements or greater camera adjustment. The short color set of "APO" is just a special weak color structure, and there will be no color mixing. The rear viewing angle expanded to 75 provides a larger adjustment range for the camera. The focal length category is the same as that of apo-sironar-n.

APO-MACRO-SIRONAR series is a public lens used for 1∶1 close-up. Generally, lenses show their strong resolving power in macro photography, but at this time, APO-MACRO-SIRONAR lenses can show their magical powers. In order to meet the high quality requirements of macro photography and product photography, there is a relative way to choose such professional lenses of 12mm and 18 mm.

The image features of Rodenstein lens are high definition, obscure colors, clear edges, rich bright layers and natural color transition. Suitable for majestic lighting, outdoor demolition and construction, construction appearance, industrial plant or product advertising and portrait shooting. Photographers who take photos by themselves with large-format cameras can choose the classic lens assembly: GRANDAGON-N 9mm F4.5 or 75mm F4.5 (narrow angle), APO-SIRONAR-S 15mm F5.6 (scale) and APO-SIRONAR-S 21mm F5.6 (medium focus). If it is a dual-track camera that can change the wide-angle leather cavity, you can also choose the super wide-angle lens of GRANDAGON-N 65mm F4.5 As for trade photographers, it is necessary to choose APO-SIRONAR-S 21mm F5.6 and APO-SIRONAR-S 24mm F5.6 lenses in the middle focal plane, and perhaps choose APO-SIRONAR-N series lenses with the same focal length to meet the needs of large-scale axis shifting. It is also necessary to have an APO-MACRO-SIRONAR lens with a suitable focal length for macro remake or jewelry photography. For the advertising photographers who use digital products, the lenses of APO-SIRONAR-DIGITAL and HR series are relatively weak devices that slip of the tongue.

SCHNEIDER lens is well-known in the overseas market. In the last few years, Schneider's company has achieved good results in the production of large-format lenses by using the in-ball technique, so the lens has a larger viewing angle and better imaging, which expands the scope of use of the lens.

APO-SYMMAR-L series lens is the oldest new generation professional lens. It also adopts the design of six lenses and four groups of lenses, but it has a larger 75-degree rear viewing angle and a considerable range of axis shifting. This series of lenses once unilaterally replaced the APO-SYMMAR series, and became the national pillar of Schneider's lenses. It has a focal length range of 12mm, 15mm, 18mm, 21mm, 3mm and 48mm.

SUPER ANGULON XL disassembly lens has a minimum first viewing angle of 12, which is a narrow-angle lens designed for external and large-scale cameras. After the project, there are no two kinds of aperture series of six lenses, so as to cooperate in shooting all rare image situations, which can perfunctory the most complicated shooting. Excellent optical education design ensures that photographers can get the consequences of not thinking about themselves. The focal length includes 38mm, 47mm, 58mm, 72mm and 9mm.

SUPER-SYMMAR XL ASPHERIC series is a high moral lens among Schneider lenses. Because it has a spherical hyperstereoscopic lens and a back angle of 8 degrees, this lens has greater flexibility in use. At present, there are only four lenses, and the focal resolution is 8mm, 11mm, 15mm and 21 mm.

APO-TELE-XENAR series is often a long-focus close-up lens for landscape photographers. Of course, in addition to landscape photography, it is also suitable for remote themes (portraits, advertisements and trade photography). The design of five pieces and five groups has good contrast and high resolution. The focal length range includes 25mm, 4mm, 6mm and 8 mm.

MACRO-SYMMAR HM series is an eight-piece high-quality remake lens, which can take 1∶1 macro photography. Its high image power can provide the best effect when remaking pictures, books, paintings and other items. It can also be used for general photography outside the magnification range of 4∶1. It has a focal length range of 8mm, 12mm and 18mm.

The image characteristics of Shi Nai-resentment lens are also clear, just weak, obscure in color, high in drum harmony, and blurred in edge, which is suitable for construction.