Math for comparing APS-C to full frame?

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turnstyle
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Math for comparing APS-C to full frame?
9 months ago

Hi all, I understand that a full frame sensor has a x1 crop factor, compared to x1.5 for APSC.

So, for example, a 24mm lens on APSC is roughly the same as a 36mm on full frame.

My question: is there a similar conversion factor for the aperture?

For example, is f2.8 on a 36mm full frame the same as f2.8 on 24mm APSC?

Thanks!

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