This is why 35mm at F2 on an APS-C sensor will produce a wider (more in focus) depth of field in comparison to a 50mm at F2 on a full frame sensor, even if the focal length appears the same. Because technically, it's like you’re shooting a full frame 35mm F2 lens on the APS-C camera, just cropping it 1.5x due to the APS-C sensor being For a lot of photographers, the commonly accepted definition is that a normal lens focal length is determined by the diagonal measurement of the image area, the film frame. For the 24mm x 36mm format of Full Frame, that is 43.3mm and for an APS-C frame, 30.1mm. Photo by pick-uppath via iStock. That means a 24mm focal length on an APS-C sensor camera will have a (cropped) field of view of 150% compared to a full-frame, resulting in a focal length “equivalent” of 36mm. Medium format
This is about 43mm on "full frame" and 28mm on APS-C. Photographs taken with wide angle lenses tend to add depth to features, longer focal length tend to flatten the image. Portraits are generally considered more complimentary if facial features are flattened slightly, hence the tendancy for the slightly longer focal length usually prefered.
The actual focal length of a lens on an APS-C camera is exactly 1 what is written on the lens. What you're probably confused about is the fact that the field of view you get from mounting a 50mm lens on an APS-C camera is the same is that of mounting a 75-80mm lens on a full-frame camera (this varies a bit because "APS-C" sized sensors vary a
This changing of the distance between the camera and the subject is what causes that distortion, not the lens itself. So any camera and lens combination that's equivalent to 50mm on a full-frame camera will give the same sort of perspective distortion. It can be 35mm on APS-C, or 25mm on Micro Four Thirds, or 63mm on a Medium Format Fujifilm
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    • full frame vs aps c focal length