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

  1. #1
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    Default Different lenses, same focal length / aperture = same brightness?

    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.

  2. #2
    Member Burnings's Avatar
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    Default Re: Different lenses, same focal length / aperture = same brightness?

    It should be different as the lens consists of different number of glasses.

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    Default Re: Different lenses, same focal length / aperture = same brightness?

    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...
    incywincyspider climbup the waterspout...

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    Default Re: Different lenses, same focal length / aperture = same brightness?

    and rounding of focal length...

  5. #5
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    Default Re: Different lenses, same focal length / aperture = same brightness?

    Quote Originally Posted by jaRv1s View Post
    and rounding of focal length...
    Please elaborate, what do you mean?

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