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09-14-2009, 09:12 PM   #1
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Scott_the_Artist's Avatar

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Does anybody have recommendations for a good, cheap place to have fungus cleaned from a lens? I have an SMC Pentax-M 50mm 1.4 that has fungus. It's light and doesn't seem to effect image quality, but I'd like to get rid of it.
Is it possible to clean it myself? I'm pretty good at things like that, but I don't have any technical training. How much would I be looking at to clean it?

09-14-2009, 09:34 PM   #2
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Depends which lens. If it's the first element or the one just behind it, it's pretty simple, just remove the retaining ring from the front and pop out the primary element. Same with the very last element. If it actually requires you to take off the K mount from the rear, you start getting into danger territory, with very very small parts (springs, ball bearings, etc.) you need to look out for during disassembly.

That said, M lenses are pretty basic, so I certainly wouldn't hesistate.

Regarding to services; well, you probably will not find a place that'll do it for you without making you wonder if it's not more economical to sell that and purchase another one on Ebay.
09-15-2009, 02:28 AM   #3
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As Rawhead says, it can be very simple. I have a Super Takumar 28/3.5 with fungus and after I finally managed to get off the name plate it was quite easy to get the first lens group out. I had to disassemble that group to get to the lens with the fungus, which was quite simple to do. (Note to others, if you plan to do this with a wide angle lens, be careful not to scratch the black paint on the edges of the lenses.) I cleaned the fungus off with methanol. The problem was that there appeared to be two lenses glued together and there was a tiny bit of fungus between those two which I could not remove.

So the message is that it can be very easy, or very difficult to remove fungus.

09-15-2009, 03:12 AM   #4
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Distilled vinegar is one of the recommended substances and possibly least likely to cause harm to both the person cleaning the lens and items within the lens. Some might recommend a mix of hydrogen peroxide and ammonia but that kicks off very evlil fumes so best avoided.


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