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daves123
Joined: 16 Jan 2009
Posts: 126
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| Posted: Thu Jun 18, 2009 7:29 pm Post subject: How scratched up can a lens be before it affects the image? |
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Just wondering how scratched up a lens can be on the face, before the image is affected?
Thanks
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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daves123
Joined: 16 Jan 2009
Posts: 126
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| Posted: Thu Jun 18, 2009 7:52 pm Post subject: |
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Thanks. Very informative, that link cleared up any doubts I had.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Thu Jun 18, 2009 8:01 pm Post subject: |
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You can slap a 2x2" sticky note onto a lens and you won't notice much difference except that color gets dimmer. Minor scratches are absolutely undetectable, except they might cause a very minor loss of ANSI contrast due to diffracted light.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jun 18, 2009 10:11 pm Post subject: |
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I once had an NEC which appeared to have been dragged by the lenses across a painted floor of some kind. There were GOUGES in the lenses, filled with paint, about as wide as my thumb. I couldn't tell there was anything wrong with the lenses when viewing the image on screen, however, I did chip the paint out of the gouges first...needless to say, imperfections on the outer lens need to be pretty darn severe for you to notice them in the projected image...
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