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Forum: Pentax SLR Lens Discussion
12-05-2017, 05:29 PM
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The only time you would set focal length is for lenses where the camera does not detect focal length. This is mainly for IBIS (in body image stabilization) and you would just input the focal length of the lens (ie 500). The ‘crop factor’ is relevant if you have many years of 35 mm experience to know what a full frame FOV is for your lenses. The crop sensors will shrink that FOV and so the 1.5 crop factor can give one some idea of the equivalent FOV. I don’t think of the crop factor as silly; it can serve a purpose. If you shoot only using crop bodies, don’t sweat the crop factor
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