Problem w/ 50mm 1.8 lens (Nikon AF)

Discussion in 'Digital Photography' started by Steve, Feb 23, 2008.

  1. Steve

    Steve Guest

    I recently purchased two used lenses from different sources, and just
    received them in the mail (yea!). Both are nikon: 85mm and 50mm 1.8
    lenses. However, when comparing images from the two, I'm noticing that
    the 50 is consistenly 1 exp position underexposed. I can compensate in
    the auto modes by bumping up the exposure, so I first thought this
    might just be a meteringt thing. However, I just tried a comparison
    shooting outdoor shots in full manual. For the same shutter speed
    (1/60), f/8 ap on the 85 gave the same as f/5 for the 50mm. f/8 on the
    50 was a LOT darker...

    Is this normal, and if not, what can I do (short of getting rid of the
    lens) .

    Steve, Feb 23, 2008
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  2. Steve

    Jim Guest

    No, it is not normal.... I check all my lenses from time to time just to
    see if something like this has happened.
    So far, they all do just fine.
    Jim, Feb 23, 2008
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  3. Lucky you.

    Any advice for the OP?

    With or without religion, you would have good people doing
    good things and evil people doing evil things. But for good
    people to do evil things, that takes religion.

    Steven Weinberg
    Ockham's Razor, Feb 23, 2008
  4. Steve

    flambe Guest

    If you bought on Ebay you may be out of luck and have to learn to live with
    exposure compensation.
    Most real stores have time-limited policies on returns.
    flambe, Feb 23, 2008
  5. Steve

    frederick Guest

    Have you any other lenses to compare them with?
    There is some variation between different lens designs in exposure,
    that's normal - but 1 stop difference seems much more than normal.
    I have read that the 85mm (IIRC the f1.4) tends to overexpose, with some
    users dialing in EV -0.5 to compensate (I don't know if the same applies
    for the f1.8 version)
    Check the aperture blade alignment by looking through the lens set at
    f22 and closing the aperture by moving the lever on the back of the
    lens. Not many lenses have blades aligned perfectly resulting in a
    perfect polygon as the lens is stopped down, but if it was bad enough to
    cause 1 stop over exposure, you should see it. If you quickly release
    the lever, the aperture should open up fully instantly.
    frederick, Feb 23, 2008
  6. Steve

    Jim Guest

    Take it to a pawnshop. You buy a brand new one with a USA warranty for only
    a little bit more than the repair costs.
    Jim, Feb 23, 2008
  7. Steve

    Tom Yost Guest

    There is not, by chance, a filter on the 50mm lens is there?
    Tom Yost, Feb 25, 2008
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