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Forum: Pentax SLR Lens Discussion
01-10-2019, 12:31 PM
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Inherently, no, the FOV would not differ. However, it's possible that the lens would not cover the FF image circle, and thus only be usable in APS-C mode, in which case the FOV would be reduced to whatever it is on APS-C. This is visualized in the third example below:
You Tube
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src="https://www.youtube.com/embed/KP3w63UDeBw?controls=1" allowfullscreen>
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Forum: Pentax SLR Lens Discussion
01-10-2019, 09:23 AM
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To put it simply: no. 55mm on APS-C gives you a 29.4 degree diagonal FoV, whereas 50mm on full frame gives you a (much wider) 46.8 degrees. Refer to the table below:
As a rule of thumb, if a lens has focal length f on APS-C, the same field of view would be achieved by a lens with focal length 1.5f on full frame (so in this case 55mm on APS-C would be comparable to ~83mm on FF). The format for which the lens was designed does not matter in this calculation.
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