Different lenses, same focal length / aperture = same brightness?


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sabee

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Mar 12, 2009
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#1
Hi guys, just wish to ask a general question.

Given any 2 lens on the market, if I set them to the same focal length and aperture, for example my Tamron 17-50 @ F2.8 and Canon EF 50mm @ F2.8 should I expect the same level of exposure at the same shutter speed? Does the size of the lens play a part too? What other factors are there? Please enlighten me, thanks.

Basic assumptions like same kinda filter, same subject etc applies.
 

karnage

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Feb 26, 2005
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#3
Possibly same, but don't be surprised if it's different. As mentioned, amount of glass, type of glass, coatings, flare control etc all play a part...
 

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