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General photography questions and answers: Discuss Cleaning an old lens?...Ok, bought a sigma prime 400mm from e-bay and thought it had fungus,but when looking through the front element at ...
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Old 27-08-2008, 23:19   #1 (permalink)
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Cleaning an old lens?

Ok, bought a sigma prime 400mm from e-bay and thought it had fungus,but when looking through the front element at a spotlight ,the inside glass seems to be coated in dust .
Is there a simple way to get it clean,or have I got to try striping it down
as I have five thumbs on each hand and don,t fancy that option.

But the lens is no good as it is,because the results look slightly fogged.

PS it,s an old one so will tinker if necessary
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Old 27-08-2008, 23:54   #2 (permalink)
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Re: Cleaning an old lens?

It may be dust, or perhaps fungus or air-borne deposits that condense on cold surfaces such as glass.

No simple way, I'm afraid. The lens will need dissecting to clean it, and they are quite complex especially if it's an autofocus lens. Have a tinker - nothing to lose.
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Old 28-08-2008, 05:13   #3 (permalink)
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Re: Cleaning an old lens?

Many years ago I took an old manual lens apart. I had dropped it so it did not work and I was curious what was inside. I could never get get it back together and wound up with a couple of good quality magnifying glasses . By all means have a look inside but no not expect to have a working lens afterwards.

On the plus side you maye get three or more magnifying glasses out of it.
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Old 28-08-2008, 21:21   #4 (permalink)
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Re: Cleaning an old lens?

I agree with both of the above, luckily it was only a cheap lens, a Sigma 400mm actually, and ended up with a load of bits...


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Old 30-08-2008, 18:58   #5 (permalink)
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Re: Cleaning an old lens?

Thanks guys, it was the only item off e-bay that was wrong so far,so not to bad.
Will have a tinker......
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