In short, the smaller the focal length, the wider the angle of view and the more 'wide-angle' the lens. The larger the focal length, the narrower the field of view and the more 'telephoto' ...
"For wildlife photography, a wide range of focal lengths is beneficial. You might want to capture closer subjects, such as a ...
A wide shot with a deeper depth of field showing ... The distance between the principal focal point and the lens is the focal length. So a 14mm lens bends light so it converges 14mm from the ...