100 Common photographic themes

The following answers: y is right, n is wrong, and there are explanations behind right and wrong. I hope the answer will help you.

1 F/ 1.4+0.4 is "faster" than the lens of f/2.

Y Because its f/ 1.4 aperture is larger than f/2 aperture, it can receive more light with the same shutter.

2. If the aperture of F/2 lens is reduced to f/8, will it be reduced to f/8 to receive more light than that of f/4 lens?

The change of n aperture has nothing to do with the previous amount.

The lens set to f/8 receives four times as much light as the same lens set to f/4.

N f/8 is less than f/4 aperture.

4. When the lens of F/2 is set to f/2.8, the received light is116 times that of f/1.

Y f/2.8 is 6 times larger than f/ 1 1 large/kloc-0.

5. If the lens of f/2 is set to f/2.8 and the lens of f/ 1.4 is also set to f2.8, then they all allow the same amount of light to reach the film.

The size of the Y aperture has nothing to do with the size of the aperture before setting, and it is all f/2.8, which is the same, provided that the shutter is the same.

The image of the object shot by the 6.200mm lens is twice that produced by shooting the same object at the same distance by the100mm lens.

The multiple of n focal length is not equal to the multiple of image.

7. The "standard" lenses of all cameras are 50 mm lenses.

N depends on the frame, for example, ordinary APS digital SLR (non-Quan Huafu) is 35mm.

8. Telescope is an accessory, which can effectively increase the focal length of the lens by enlarging the image of the film.

N Enlarging the image will not increase the focal length.

9. Moving the lens barrel back and forth can change the aperture of catadioptric lens. Design principle of Y-fold lens

10. With an 80~200mm zoom lens, you can only shoot at the 80mm end or 200mm end, but not at the focal length between them.

An internal focal length of N 80-200 can be used.

1 1. If a macro lens is used to focus on 1 stamp, the size is 1 square inch, and the image on the film is also about 1 square inch.

N According to the magnification of the macro lens, 1: 1 has equal talents, 1: 2 has half talents, and so on.

12. Glare is caused by the light reflected from the edge of the trailing plate behind the film.

N When bright light passes through the camera lens, some light will be reflected by the surface of the lens unit, leaving spots on the negative, which is called glare.

13. When shooting portraits, using 105mm lens is easier to produce perspective distortion than using 28mm lens.

The shorter the focal length, the more serious the barrel shape.

14. For objects with different camera distances, the farther you shoot, the closer you look.

Y this is the basic perspective law of photography.

15. For a 35mm camera, a 28mm lens can be used as a good portrait lens.

N focal length is too short and the distortion is serious.