Lens Focal Length: Normal, Short, Long, Special Lenses

  Lens focal length is the most important characteristic of a lens. One of the prime advantages of a single·lens reflex camera or a view camera is the interchangeability of its lenses; the reason photographers own more than one lens is so that they can change lens focal length. … PDF: Lens Focal Length, The Basic Difference Between Lenses   Normal Focal Length The Most Like Human Vision A lens of normal focal length, as you might expect from the name,  produces an image on film that seems normal when compared with human vision. The image includes about the same angle of view as the human eye Read more

Choosing a Lens for Analogue 35 mm Camera

  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