dirty lenses

Discussion in 'Australia Photography' started by k, Jan 26, 2011.

  1. k

    k Guest

    Back when I lectured, I would often find students grumbling about the lenses
    in the photo store (we lent out camera kits), blaming them for their fuzzy
    images or the white spots on their prints. More oft than not it was their
    poor efforts at focusing their enlargers or rough handling of negs - but
    they'd decline to see that logic.

    If I had the time, I'd whip off a print to show them their neg was in fact
    fine, their lens fine, and they'd be better off spending time paying
    attention to their lecturer in the darkroom classes, try to focus the
    enlarger and maybe occasionally store their negs somewhere other than the
    bottom of their bag .. If I had less time I'd wave a cat lens at them and
    ask them if they thought the big black circle in the front of the lens would
    degrade the image quality <blank stares>.

    Sometimes I'd demonstrate (less dramatically than the link below) that since
    nothing in the optical pathway was in focus, the gunk they saw on their
    film, scans, prints or whatever was more a consequence of mistreatment of
    the negatives than anything relating to the lens - and I showed this by
    sticking a piece of electrical tape across a lens - white demonstrated a
    general lowering of contrast - black showed basically a reduction in light
    levels .. and I tried to tell them THAT was why you fixed deep scratches in
    a lens by painting them black ! =)

    A decent box lens hood could almost eliminate the net effect of a piece of
    white tape.. and overall, a lens hood went a lot further to preserving
    maximum contrast and sharpness than giving the lens a good clean ever did ;)

    like I said though, this is dramatic

    k, Jan 26, 2011
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  2. k

    Noons Guest

    (I've seen great bargains out there for scratched lenses, often going
    for half the cost of an "unblemished" front element lens)

    Damn, you let the cat out of the bag!!!!!!!!!
    Now all scratched lenses will go up on ebay!!!!!!!!
    Noons, Jan 27, 2011
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  3. Murray Daniels, Jan 29, 2011
  4. k

    k Guest

    k, Feb 1, 2011
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