Crop sensor VS full frame lenses and effective aperture on crop bodies

Started May 9, 2014 | Questions thread
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nickolas84 Junior Member • Posts: 36
Crop sensor VS full frame lenses and effective aperture on crop bodies

If I understand correctly, there are lenses designed for crop bodies that will produce big vignetting on larger sensors. How do they compare to full frame lenses on crop bodies in terms of how fast they are?

I mean doesn't concentrating the light on an APS-C sized area make the lens faster compared to concentrating the same light on a 35mm area, given the same aperture and focal length on an APS-C body?

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