Jenny asks…Can a 49mm lens cap fit my 50mm lens?I have a pentax film camera.mr.eos answers:Hi CC,
The problem is that you are confusing the focal length of the lens with the filter diameter (which is also the size of the lens cap). For many years Pentax designed most of their wide angle, standard and small telephoto lenses to accept 49mm filters/lens caps.
The standard filter sizes in use for interchangeable lens cameras varied by brand. Typical sizes were 48mm (Canon), 49mm (Pentax),
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