Forum: Pentax SLR Lens Discussion
11-12-2014, 09:51 AM
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If I'm correct, the focal length is always the same on either format. It's the field of view that changes. APS-C cuts off the edges of a FF image making a narrower field of view like longer lenses on FF. An APS-C image circle on FF would be just that, a circle or have severe vignetting but, the same focal length. I'm sure someone will correct me if I'm wrong.
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