The advantage of interchangeable lens cameras like DSLRs and mirrorless cameras is that you can change lenses for different kinds of photography. There are many different types of lenses, often with specific names. Lenses are usually characterised or grouped by their focal length. It might be more useful to use their angle of view instead, […]
An image without any lens distortion, so that straight lines appear straight. Almost all lenses are rectilinear lenses. The only exception is ultra-wide 'fisheye' lenses.