FF lens on APS-C resulting f number.

Started May 9, 2014 | Discussions thread
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bugeyed
bugeyed Senior Member • Posts: 1,337
FF lens on APS-C resulting f number.

Is there a reduction in max aperture when using a FF lens on APS-C body?
I understand how a speed booster/focal length reducer can increase the f number, but with a regular adapter you are increasing the focal length & not changing the entrance pupil. Or is the entrance pupil effectively changed because the APS-C sensor does not receive all of the light from the image circle? Anyway, is there a net loss in speed when using a FF lens on APS-C body?
Thanks,
Kev
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I just think that things should work the way I expect them to.

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