I grew up with film SLRs (full-frame, of course), and the rule of thumb was "the slowest shutter speed you should try to hand-hold is 1/your lens focal length in mm." e.g. 1/50 sec for a 50 mm lens.

A much more important value is the size of the camera's aperture, commonly listed as an f-number. The f-number is a ratio between the focal length and size of the hole, and tells you how much light ...

Photography is full of fancy terms and complicated science, but we are here to explain it all to you in simpler terms. Today we are focusing on focal length. This term gets thrown around often, ...