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would these scratches really not effect performance?

Discussion in 'Open Discussion' started by tdekany, Jul 28, 2012.

  1. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    This lens is on e bay and the owner claims it is only cosmetic.

    Can someone explain that to me?


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  2. Hikari

    Hikari Mu-43 All-Pro

    Nov 26, 2010
    When shooting into the sun, it could be a problem. In most situations you would never see them. But why would you want such a lens? If the owner has taken such care, what else has he done to it?
  3. Tincam

    Tincam Mu-43 Regular

    Apr 25, 2012
    If it's the right price, go for it. You'll never notice them anyway. Lenses like this can be bargains.
  4. usayit

    usayit Mu-43 Hall of Famer

    Rarely be noticed.. maybe a little flare in certain situations (sun).

    Someone once told me that a black wax pen followed by a element cleaning can help. It fills the deep scratches with black wax that can absorb light that would otherwise bounce around causing flare. Never tried it myself though.
  5. cookme

    cookme Mu-43 Regular

    May 25, 2012
    (assuming you are interested at buying it...)

    Yeah... only if you can get this real cheap, otherwise get it from others. From the picture you can see plenty of scratch marks on the plastic. Like Hikari said, this lens probably has either gone through a lot, or was not carefully used, and might be just a bit too much for a zoom lens.
  6. phigmov

    phigmov Mu-43 Hall of Famer Subscribing Member

    Apr 4, 2010
    Theres a rather wonderful look at how much damage a lens can take before it affects image quality over here -

    Dirty lens article

    Not particularly scientific but its still pretty interesting.
    • Like Like x 1
  7. Promit

    Promit Mu-43 All-Pro

    Jun 6, 2011
    Baltimore, MD
    Promit Roy
  8. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    Thank you guys very much for your replies. I decided not to pursue it, but what would be a "good price" for such lens?

  9. Tincam

    Tincam Mu-43 Regular

    Apr 25, 2012
    I wouldn't pay more than KEH's "ugly" price for this lens.
  10. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    Thanks! What would that price be?
  11. lenshoarder

    lenshoarder Mu-43 All-Pro

    Nov 7, 2010
    It would not effect IQ. It greatly effects resale price though.
  12. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    Thanks. I realize the resale value.

    I offered $300, he is asking now $350.

    Initially he wanted $425! :eek: 

    Waht would you pay?
  13. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    Just found one for $425, never used. :thumbup:

    Thanks everyone!
  14. arentol

    arentol Mu-43 Veteran

    Jun 29, 2012
    If $425 is the normal price a used one in good condition goes for then I would pay $350 for that one in a heartbeat.... Unless I planned to resell before I got my moneys worth out of it.

    The lens itself will perform flawlessly. You will NEVER see any effect from those scratches on a photo. Not even a little bit. Even at f/22 and shooting with the sun at the edge of the frame you won't see them.

    But some people freak if there is the slightest imperfection in their lenses, despite tests like Lens Rentals that show how irrelevant such scratches are, and so about 20% (from 425 to 350) has to be knocked off the price because of those scratches. But 30% (from 425 to 300) is really a bit too much to take off the price for just 2 small marks on the front element.
  15. tdekany

    tdekany Mu-43 All-Pro

    Dec 8, 2011
    I appreciate your info. I learned a lot form it, but as I said I found one that was never used for $425. It was a buy it now, so I jumped on the opportunity. Plus it is 90 miles from me. :biggrin:

  16. CUB

    CUB Guest

    Unlike scratches on the rear element of a lens, which can seriously degrade an image, scratches on the front element are not usually a problem.

    Sometimes, however, they can cause flare. But this can be prevented by carefully filling the scratches with what we Brits call "Indian Ink". I think it's called "India Ink" in the US. But it is the same product.

    India ink - Wikipedia, the free encyclopedia

    I have an old SMC-Pentax A 35-105mm f/3.5 varifocal lens which I scratched very badly through sheer carelessness. It has two very deep gouges across the centre of the front element, one about an inch long and the other just over half an inch.

    It flared badly when I tried it. Then I filled the scratches with Indian Ink. Result: its performance is indistinguishable from a near mint copy with perfect glass that I also own.

    A word of warning: Indian Ink is not completely waterproof and wet cleaning of a front element runs a risk of removing some of it. I protect my lenses with UV filters so this is not a problem for me.
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