What is the distance between the photographer and the camera when using Canon 50mm lens?

The nearest focal length of 50mm is about 45cm, not less than 45cm.

Focus conversion

On models with different frames, the viewing angles of the pictures taken with the same focal length are also different. When the same lens is connected to the Quan Huafu model, the photos taken have a larger viewing angle, while when it is connected to the small-format model such as APS, the photos taken have a smaller viewing angle. This effect is the same as the different viewing angles caused by the focal length of the lens.

For example, Nikon D700 comes with a lens of 17mm, which is 1.5 times the viewing angle of the picture taken when Nikon D90 comes with this lens.

The focal length of 26mm is 17mm of the same APS-C on the Quan Huafu model, and the focal length of 26mm can be called equivalent focal length, where 26/ 17= 1.5 is the focal length conversion multiple. The concept of frame has been introduced before, and the multiple of photosensitive element size is the conversion multiple of equivalent focal length.

There is a formula when converting equivalent focal length, that is, equivalent focal length = lens focal length x conversion multiple. For example, the effect of APS-C frame camera using 28-70mm lens is equivalent to that of full-frame camera using 42- 105mm lens.

Extended data:

Optical clarity

If you have seen "f =" in the English manual of the camera, then the number behind it is usually its focal length, that is, the focal length. For example, "f=8-24mm, 38- 1 15 mm (equivalent to 35mm)" means that the focal length of this camera is 8-24mm, and the oblique viewing angle is equivalent to 38- 1 15mm of the traditional 35mm camera.

Generally speaking, the standard lens focal length of a 35mm camera is about 28-70mm, so if the focal length is higher than 70mm, it means that the telescopic effect is supported. If it is less than 28mm, it means that it has wide-angle shooting ability.

"Focal range" is the extension of focal length, which is usually divided into general shooting distance and close-up distance. The general shooting distance of a camera is usually marked as "from a certain centimeter to infinity", and the products designed in the recent stage often provide close-up shooting function (macro) to make up for the problem of not focusing in the general shooting mode.

Some cameras emphasize the magical ability of supporting 1 cm close-up, which is suitable for shooting fine objects.

Baidu encyclopedia-focal length