I don't understand why this should be the case with lenses?

Discussion in 'Digital Cameras' started by Mr.Will, Jul 26, 2003.

  1. Mr.Will

    Mr.Will Guest

    I have two lenses, one is a 75-300f4/f5.6 and a 35-110 f 4-f5.6
    FOr some reason I need less light to get a decent exposure and colour
    saturation with the 75-300 lens.
    Yet both are f 4/5.6 - it doesnt seem to make sense to me.
    Also with my prime f 1.8, if I shoot at f 4 it seems once again to require
    less light for a decent exposure.
    Perhaps this is due to it being prime and not zoom - Ive heard prime is
    simply better due it being optimised for a particular job.

    Still it seems odd to me that f4 doesnt always mean f 4.
    Can anyone explain this to me?
    Mr.Will, Jul 26, 2003
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  2. Mr.Will

    Mark M Guest

    Hoods don't restrict the light in a sense that would be significant here.
    He didn't include enough details about exposure for anyone to answer his
    question. His camera body may be compensating differently, but we wouldn't
    know. Also... If he's using print film, then all bets are off--since the
    processor of his film has FAR more control over exposure than he (the
    photog) did.
    Mark M, Jul 26, 2003
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