Len format 'Brightness'

Started 3 months ago | Discussions thread
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jimcl
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Len format 'Brightness'
3 months ago

Just a quick thought/question. If I have two lenses, both 50mm f1.8, one being DX and one being FX, and put them on a DX camera, would the DX lens create a brighter image on the sensor? I would think the FX lens would throw a lot of light outside the crop sensor area, and would basically be 'wasted'. If the crop factor is in fact 1.5, then strictly by area, the full frame lens is focusing the same image on 2 times the area at the sensor plane. This should amount to 1 f stop. Is this really the case? If so, DX on DX, FX on FX should be equivalent.

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