With wide angle lenses covering be­tween 63° and 115°, there is some distortion on the wider angles. For a 35mm SLR, a 35mm focal length covering 63° may not be wide enough if your standard lens is 50mm; 28mm covering 75° would be a better choice. A 24mm covering 84° is going to extremes and, unless you particularly need this coverage with its risk of image distortion, the 28mm is the most sensible all-round choice. … PDF: Choosing a Lens for Analogue 35 mm Camera   Why Change Lenses? Altering distance and focal length. Each picture was taken with a lens of different focal length 135 mm format, but  the camera distance was Read more