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01-15-2015, 10:04 PM   #1
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SMC M 85/2 cement separation - fixable?

I was lucky enough to acquire a like-new Pentax M 85/2 lens. The lens appears to have spent its entire life on a shelf. Unfortunately, there is separation or balsam "bubbling" happening on the inside. It actually looks quite pretty under a point light source (much more interesting than I was able to capture). Definitely not fungus. No apparent effect on IQ under diffused light but I am worried that it will get worse, i.e. significant loss of contrast, will occur.

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Anyway, the lens is otherwise so like-new that it pains me to return it to the seller.

Has anyone here ever tried to fix a similar problem, successfully?


Last edited by akptc; 01-15-2015 at 11:04 PM.
01-16-2015, 12:40 AM   #2
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my DA 18-55 have like this, it can't fix, but in my case it wont take any effect on photo, you can try at f 22 and see it take effect or not
if get worst that mean you get a fog/ haze, my DA L have it and i can't use it any more because the photo like in fog
01-16-2015, 12:51 AM   #3
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My M 85mm has the same. I wonder if this is a common problem for this lens. My copy is usable as long as the subjects not back lit. I've heard here that lens separation is an expensive or difficult fix, but I would be interested in peoples opinion as well.
01-16-2015, 02:44 AM   #4
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QuoteOriginally posted by EJMzagsfan Quote
My M 85mm has the same. I wonder if this is a common problem for this lens....
+1, this was my M85 https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/234843-fung...hing-else.html

01-16-2015, 12:47 PM   #5
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Thanks dcshooter ! It was super educational to chat with you and I will be sending you the lens for repair today. This is very exciting, I can't believe I might actually end up with a minty 85/2
Andy
01-17-2015, 06:15 PM   #6
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What's the best way to visualize, or test for the defect?
01-24-2015, 11:50 AM   #7
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It was just oil, sent it for cleaning to dcshooter (thank you Sir for such a speedy service) and now am just waiting for the mail
01-27-2015, 05:03 PM - 1 Like   #8
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The lens is back from cleaning and looks amazing. Time to start the shootout with the M 100/2.8

01-29-2015, 06:32 AM   #9
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Woah.... Wait. What?!

Dcshooter, you can repair lens separation?!
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