Special effects in photography

1. Nikon and Sony use DX, and the conversion factor is 1.5 times. Canon uses Aps-c (the size is slightly smaller than DX format), and the conversion coefficient is 1.6 times. FX is Quan Huafu (35mm film size).

2. The size of Quan Huafu is equal to 35mm film, the frame of aps-h is slightly smaller than FX but larger than DX, and the conversion coefficient is 1.3 times. For example, canon's new top machine 1D mark4 is APS-H.

The focal length (physical focal length) of a lens is always so much. For example, the same 50mm standard lens, the field of view used by a full-frame camera is such a range close to the human eye. The viewing angle of the DX camera (multiplied by 1.5 times) is the same as that of the 75mm lens of the full-frame camera, which is equivalent to narrowing the field of view, but the perspective relationship and depth of field blur remain unchanged. The specific reasons can be checked.

4. Yes, the DX special lens can only be used on the DX fuselage, and the equivalent focal length should be multiplied by 1.5 times, and it cannot be used on the Quan Huafu.

5. The principle has been answered in 3. The size of DX photosensitive element is relatively small, so the cost is greatly reduced. This kind of fuselage has advantages in ecology, bird photography and sports photography, because the equivalent focal length is multiplied by 1.5, and better effect can be obtained without cutting.

Talent is not, I hope it is useful to the landlord! I wish you an early and smooth start!