Enjoy! Digital SLR camera

[How to Change the Coverage of Lenses]See how different lenses change the coverage area[Lenses: Angle of view]

The lens focal length indicates how much area it can capture

Angle of view expresses the area depicted in the photo as an angle seen from camera

The angle of view changes according to the focal length of the lens. The longer the focal length (the larger the lens number = telephoto), the narrower the angle of view; the shorter the focal length (wide angle), the wider the angle of view. Therefore, when shooting from the same position, a wide-angle lens (with a wide angle of view) will capture a larger area, making the subject seem smaller in the photo, whereas a telephoto lens (with a narrow angle of view) will depict a smaller area, making the subject seem larger.

The sensor size also affects the “coverage” even with the same lens

The angle of view greatly affects how the picture will look

The angle of view is the area that can be portrayed within the photo. Lens catalogs usually list the angle of view as the diagonal angle across the photo. The angle of view of a 50 mm lens, which is considered the closest to the perspective of the human eye, is about 46 degrees (when using a 35mm sensor). Generally speaking, lenses with angles of view wider than this are called wide-angle lenses and lenses with angles of view narrower than this are called telephoto lenses.
The size of the imaging sensor changes the angle of view of a lens. The smaller the imaging sensor, the narrower the angle of view. For example, the angle of view of a 50 mm lens on a camera with a 35mm full-frame sensor is about 46 degrees. But the angle of view through the same lens on a camera with the smaller APS-H size sensor is about 37 degrees and only about 30 degrees on a camera with the even smaller APS-C size sensor. The 37-degree angle of view on the APS-H sensor is equivalent to a 65 mm focal length lens on a 35mm sensor; the 30-degree angle of view on the APS-C sensor is equivalent to an 80 mm focal length on a 35mm sensor. Thus, the normal 50 mm lens on a full-frame camera (angle of view, approximately 46 degrees) functions like an 80 mm medium telephoto lens when attached to an APS-C camera.