Popular Focal Lengths
Many lens manufacturers produce or produced prime lenses at or near the following focal lengths: 20mm, 24mm, 28mm, 35mm, 50mm, 85mm, 105mm, 135mm, 200mm, 300mm, 400mm, 600mm. For prime lenses between 24mm and 200mm many manufacturers produce two or more lenses with the same focal length but with different maximum apertures to suit the different needs of photographers. Additional focal lengths can be created by using a teleconverter.
Read more about this topic: Prime Lens
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