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03-05-2011, 04:33 AM   #1
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What's going on with this lens? Rainbow marks?



Any ideas anyone? Oil come off the blades??

03-05-2011, 07:03 AM   #2
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Looks like cleaning residue or marks on an inner surface. Does it affect the image?
03-05-2011, 09:34 AM   #3
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QuoteOriginally posted by DanielT74 Quote
Oil come off the blades??
Not a chance. Could be the fungus eaten away the coating?
03-05-2011, 12:30 PM   #4
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I doubt that will affect photos.

03-05-2011, 03:04 PM   #5
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This lens is for sale, so I hav no idea if i affects the images or not. The seller says he does know either... But yes, cleaning marks is the most likely cause..
03-05-2011, 03:07 PM   #6
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I doubt that is etching from fungus, as they are all relatively thick lines moving in the same direction, whereas fungus tends to produce very thin filaments in a radiating fashion. Probably cleaning marks from scrubbing too hard with an abrasive material. I agree, it is unlikely to affect image quality in any appreciable way.
03-05-2011, 04:57 PM   #7
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The colours are caused by thin film interference, very small changes in the thickness of some coating or contamination (on the order of the wavelength of light) cause the different colours.
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