Significance of lens parameters of SLR camera

Question 1: What do the lens parameters of SLR cameras mean? Question1:18-135mm is the focal length between18 and135mm, and F/3.5-5.6 is F3.5 (ending with18mm) to F5.6 (/kloc). The smaller the f value, the larger the aperture.

Question 2: You haven't written all the parameters of this header. I don't know if it's ASP or full-width (full-width is 135 camera). If it's ASP, it's probably a 32-243mm 135 camera. It's about this. Every shot is different. It is probably the standard value of ASP lens multiplied by 1.8 (generally 65438).

Question 3: Telescope. . . . You divide 135 by 18, which is 7.5 times zoom.

Question 2: What do the parameters of SLR camera lens mean? 1, EF: Quan Huafu electronic focusing lens (autofocus lens), which can be used by all Canon digital SLR cameras;

EF-S: The lens for Canon APS-C fuselage can only be used on APS-C fuselage;

2.18-55 mm/18-135 mm: The focal length of the lens refers to the distance from the principal point to the focal point after lens optics. The length of the focal length of the lens determines the size and angle of view of the imaging. (For example, 18-55mm: refers to a zoom lens with a focal length of 18mm-55mm)

3. Please refer to the attached figure for the viewing angle corresponding to each focal length:

Question 3: How to choose the lens of SLR camera? What do the parameters of the lens mean? 1, the choice of lens depends on your own use needs and shooting theme. Seeing that you are a rookie, take the most common shots as an example. EF-S 18-55mm is the standard zoom, and it is good to have a wide-angle end of 18mm (actually, it has to be X 1.6) to cope with the scenery. 18- 135, if the telephoto end is longer, you can shoot something farther. 18-200 needs no explanation. For the average novice, Canon's EF-S18-135mis and Nikon's Nicole 18- 105mm VR headphones are enough! 2. Canon lenses are divided into EF and EF-S, and EF can be used for full-frame or non-Quan Huafu fuselage. EF-S can only be used for non-full-width fuselage. If you don't understand these two technical terms, you can look them up. ). 1:3.5-5.6 means that the maximum aperture is floating at F3.5-F5.6, and 1:F2.8 means that the maximum aperture is unchanged. IS stands for Canon's optical image stabilization system. USM stands for high-performance ultrasonic motor with high speed and low noise. Nikon's lens brand is Nicol, AF Nikor relies on the body focus motor to drive autofocus, and AF-Snikov is an ultrasonic motor built into the lens. VR is Nikon's optical anti-shake system.

Question 4: What do the parameters on the camera lens mean? For example, "f = 7.8 mm-23.4 mm, 38 mm- 1 15 mm (equivalent to 35mm)" on the lens means that the focal length of the camera is 7.8 mm-23.4 mm, which has triple optical zoom capability and the diagonal angle of view is equivalent to that of a traditional 35mm camera. Generally speaking, the standard lens focal length of a 35 mm camera is 28 mm ~ 70 mm, so if the focal length is higher than 70 mm, it means that the telescopic effect is supported, and if it is lower than 28 mm, it means that it has wide-angle shooting ability. AI: automatic maximum aperture transfer technology. Published in 1977, used for manual lens. Logo does not appear in the lens name, and the smallest number on the aperture ring of AI lens is green. AI-S: automatic shutter index transfer technology. Published in 198 1 for manual lens. There is no logo in the lens name, and the smallest number on the aperture ring of AI-S lens is yellow. AF: autofocus technology. The AF in the name indicates that this is an autofocus lens, but the lens itself has no motor. If the body does not have a focus motor, it cannot focus automatically. AF-I: 1992 lens has built-in motor and CPU contacts, which are mainly used for professional telephoto lenses. Instead, af-s, AF-S: autofocus lens with built-in SWM ultrasonic motor. This kind of lens can also achieve autofocus on low-end cameras such as Nikon D5 100/D3 100 without a body motor. ASP: Indicates that an aspherical lens is used in the lens. CRC: short-range error correction system. The system enables photographers to obtain excellent image quality when shooting at close range and increasing the focus range. D: focal length data transmission technology. D-lens supports 3D matrix photometry. DC: defocused image control. Nikon original lens can provide unique zoom control function. Its main feature is that it allows fuzzy control of the foreground or background of a specific object to obtain better defocus imaging. DX: Special lens for APS-C camera, with small image field design, can't be used on Quan Huafu fuselage. Ed: That means ultra-low dispersion lenses are used in the lens. G: G lens cancels the traditional manual aperture ring. G lens often appears on Nikon's latest lens together with AF-S, showing an upgrading trend. Macro: Macro lens. N: It was once used to represent a new lens, but now the N with a hexagonal bottom on the lens means that the lens is coated with nanocrystals. PC-touch shift: axis shift lens. Radio frequency: rear group focusing technology. S: Thin, appearing on some thin lenses. SIC: super composite coating. TC: rangefinder. VR: image anti-shake system. This shows that the lens has anti-shake function. The logo on the lens is generally the logo on the attack map, and you can know a series of information such as the focal length and maximum aperture value of this camera. A method of viewing camera lens.

Question 5: What do you mean by the number of lenses in a SLR camera? Each brand has a different label. You can't tell whether the lens is good or bad just by looking at the parameters.

For example:

Nikon AF-SD X18-55mm F/3.5-5.6g VR nikkor lens, only a few hundred dollars,

Nikon AF-SD X17-55 mm F/2.8 G IF-ED autofocus lens S-type, the parameters are not much different, but this lens costs more than 10,000 yuan.

Let me take 18-55 as an example to roughly explain the meaning:

AF-S autofocus lens, built-in focusing motor, AF type, no focusing motor, focusing is driven by the body motor;

DX is a lens specially designed for APS frame fuselage, commonly known as half head;

18-55mm focal length can be changed from 18-55mm;

F/3.5-5.6 Maximum aperture F3.5-5.6; ;

G this lens has no aperture ring design, aperture adjustment must be completed by the body, and it also supports 3D matrix metering;

VR lens displacement damping system, also known as anti-shake.

Question 6: Please introduce the common sense of SLR cameras. What are the parameters of Canon's lens? Take Canon's EF-S 18-200mm1:3.5-5.6IS lens for example ~ EF-S refers to Canon's mouth (designed for an incomplete SLR), and18-200mm refers to the focal length. IS stands for Canon's image stabilizer, anti-shake. (Nikon is VR, Sima is OS, Longteng is VC, etc. ) "Three major disciplines"

1。 The lens is used for photography, not for burning money. "Equipment School" turns photography into the art of lens appreciation and collection, which puts the cart before the horse and is not desirable. However, it is also a pleasure to talk about equipment and exchange ideas. Fun is not having.

2。 Even if there is a good lens, the most important thing is the head behind the lens. The lens is a means, not an end. More energy should be put on how to use the lens well and make a good film. There are many discussions about the use of lenses for reference.

3。 Turn off the lens when it's tested. In order to test filming, it can be endless. Cutting wood and sharpening knives is addictive, but don't miss the important event of cutting wood.

"Eight Points for Attention"

1。 The lens is more important than the fuselage. Limited funds should be invested in unlimited lenses. In the end, the camera decides everything. The difference in lens imaging may be obvious. The ultimate problem of buying a fuselage is how to save money on buying a good lens. Nowadays, the lowest DSLR body has met the basic requirements of professional photography, and professional photos can be taken in terms of image quality. For non-professionals, some special functions and all-metal waterproof body are completely redundant. The fuselage is developing too fast and must not be used as durable goods. /kloc-launched a generation in October and August, and was quickly eliminated. Driven by imaging, printing and large-screen display technology, we should be prepared to change the fuselage within three to five years. A good lens is different. It can be used for a lifetime. In addition, good lenses are more valuable in the second-hand market.

2。 Canon 18-55mm is just an introductory transitional coach head, which can be used at will, and the focal length is very affordable. When you don't have a good start, you can use it temporarily. If possible, you'd better borrow one or buy a second-hand one, so you can save money. People hold it for a short time. If it is still used frequently, it shows that users have not left the primary stage of DSLR and have not fully understood the importance of lens to photography. Canon's marketing strategy is to get rid of this condom sooner or later. Look at the second-hand price18-55-unwanted garbage (new ones can only be sold at half price on ebay)! So 18-55 is preferred, which is equivalent to a chicken rib.

3。 Canon 50mm/F 1.8 II is a cost-effective head. The imaging quality can be comparable to that of a professional L-head. You can save money on condoms to buy this standard lens. If you don't have enough money, you can't buy a better zoom lens for the time being. With this title, you can make a very professional and delicious DSLR movie. Portrait of flowers, occasional scenery: just use 50mm/F 1.8, study the application of large aperture (see more), and you can make a good film soon.

4。 "A Mirror Walking the World" has no good result. Optical technology limits the zoom ratio of a good lens to three or four times. 18-200mm is easy to use, but the film is soft (unclear), especially the telephoto part. After all, the function and fun of DSLR lies in the ability to change lenses.

5。 The larger the aperture, the more expensive the lens. F2.8 is twice as expensive as F4, but when the aperture is opened to F2.8, the imaging of the lens cannot be guaranteed to be as good as F4. When choosing a lens, we should consider whether the super-large aperture is really commonly used to avoid waste. If you just want to have a big aperture addiction, the cheap 50mm/F 1.8 is more enjoyable than F2.8!

6。 For a relatively cheap lens, the aperture is reduced by two or three steps, generally at F8 and F 1 1, and the resolution will be close to that of a good lens. The user loses the technical guarantee of a good lens when the light is dark, the movement speed is fast and the depth of field is small. Even if the lens is good, the aperture is closed by two or three gears, which usually performs best.

7。 Anti-shake IS lens is very practical. Without it, tripods or monopods are very economical.

8。 Carefully consider the more expensive EF-S lens (APS-C format only). If you want to buy it, it is not recommended to hold it for a long time. It is the general trend for the fuselage to transition to 5D full width. When it is upgraded, EF-S will become a waste. Look at today, how many people are still using A- 1 and its lens that can only be focused manually?

Word summary

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Question 7: What do the focal length parameters of SLR cameras mean? Lens, whether SLR or other cameras or other optical equipment, has the main parameter of focal length. The focal length is defined as the distance from the optical center of the lens to the imaging focus.

Question 8: What do you mean by the lens parameters of SLR cameras? Mainly the parameters of aperture and focal length. Generally, the larger the aperture, the more expensive it is. The focal length depends on the purpose.

Question 9: The data on the lens of SLR cameras comprehensively introduces many common SLR lens data: aperture: marked as 1: x or 1: x-y on the lens, the former is a constant aperture. The latter is that the minimum focal length has the maximum aperture, and the maximum focal length has the minimum aperture ~ ~ Under the same parameters, the larger the aperture means the better the lens quality ~ ~ Focal length: there is a difference between fixed focus and zoom ~ ~ As the saying goes, the quality of fixed focus is better than that of zoom lens ~ ~ ~ But the zoom lens has a wide coverage and is convenient to carry, so the lens with a small minimum focal length is often said to be the wide-angle end ~ ~. The greater the maximum focal length, the greater the magnification ~ ~ ~ However, large zoom lenses should pay attention to barrel distortion and pillow distortion ~ ~ The choice of lens aperture: filter, UV, polarizer and hood. Lens mount: Sony's EOS C, Nickel N, PK P, M, Leica's R. Other secondary lens parameters include lens composition and quantity (X groups of X films) and coating conditions (low dispersion, etc. ), whether there is lens anti-shake, what frame machine (APS and Quan Huafu, etc. ) Suitable for manual zoom, manual aperture, manual focus or automatic lens. The motor of automatic lens also includes ultrasonic Martin ultra-quiet motor. Finally, there are some professional indicators in lens evaluation. Baidu or Google will do ~ ~ ~ I hope I can help you.