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02-22-2011, 06:59 PM   #1
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Hundreds of small dots undernearth front element

Hi I recently got a Porst 1.2, but I noticed it has a ton of very small dots under the front element. They are pretty uniformly spread out and some look like they are in a straight line. Again, they are incredibly small and can only be seen at a certain angle. Any ideas what they could be?

02-22-2011, 07:29 PM   #2
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Dust?

02-22-2011, 07:32 PM   #3
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Sample?
02-22-2011, 07:39 PM   #4
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I'll get pics up in an hour. there are literally thousands of little white dots

02-22-2011, 07:42 PM   #5
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If it's on the outside, then it's just dirt/water and can be cleaned. If it's underneath, then it's probably fungus or haze.

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02-22-2011, 08:31 PM   #6
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heres the dots
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02-22-2011, 08:48 PM   #7
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Could it be stains from a spray of water or cleaner? Try to wide it off with lens cleaning tissue and lens cleaning fluid. That can't harm and perhaps that'll solve the mystery.
02-22-2011, 08:54 PM   #8
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At first that's what I thought. But when I tried cleaning it it was apparent that these spots are underneath the lens.

02-22-2011, 09:08 PM   #9
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Deterioration of the lens coating? It doesn't look like fungus at all.
02-22-2011, 09:15 PM   #10
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How thick is the lens coating? The spots, although you can't tell from the photograph, look to be around a mm under the surface. It's very hard to say though.
02-22-2011, 09:15 PM   #11
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It isn't air bubbles in the glass is it?
02-22-2011, 10:28 PM   #12
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Looks like element separation to me.
02-22-2011, 11:51 PM   #13
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I'm more willing to bet that someone has taken this lens apart before, Tried to clean it and did a shitty job of it. What kind of lens is it? I agree, it looks like dried water droplets or something like that. Just on the inside rather than the outside.

02-23-2011, 08:50 AM   #14
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Talking to the previous owner, apparently someone did open it up. It does look like little water spots, which often can form those straight line patterns. I'll have to buy a half mm flat head screwdriver to take the front element off and check.
02-23-2011, 09:00 AM   #15
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Spots = spray = mist = aerosol of oil fractions from helicoid grease breakdown?

In any case, options are to leave it alone while watch to see if it gets worse, and, to open the lens and clean it. I would leave it alone. To clean I'd try removing and cleaning the front element first, as an indication of how the remaining elements will 'clean' -- if front cleans well, I'd clean as many elements as I can within my skills.
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