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05-24-2010, 07:29 AM   #1
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How to disassemble the FA 28-70mm/F4 AL ?

There is some mold wire one the inner glasses. I want to disassemble the lens, and clean the glasses. Any one can tell me the steps to disassemble the lens ? With photo is better, Thanks a lot!

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Last edited by nanaky; 05-24-2010 at 07:31 AM. Reason: uploaded wrong photo
05-24-2010, 07:35 AM   #2
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I strongly suggest against doing this yourself...if you absolutely need to, try to locate the parts manual online, if one has been uploaded for this lens.

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05-24-2010, 07:48 AM   #3
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some one has uploaded 2 pieces of disassembled lens, but they are not enough.
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05-24-2010, 08:24 AM - 1 Like   #4
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QuoteOriginally posted by nanaky Quote
some one has uploaded 2 pieces of disassembled lens, but they are not enough.
Well, there are more pictures where that came from.

if the 'fungus' looks like this :


Don't bother, I could not remove it, it is probably between these two cemented (!) lenses



05-24-2010, 10:55 PM   #5
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QuoteOriginally posted by glasbak Quote
Well, there are more pictures where that came from.

if the 'fungus' looks like this :


Don't bother, I could not remove it, it is probably between these two cemented (!) lenses

Looks like the infamous element separation problem...
05-24-2010, 11:11 PM - 1 Like   #6
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I've got one which had a small amount of fungus. I was able to remove it by going in from the rear.

I had to first remove th light baffle with the square hole in it (I probably opened the screws around the bayonet but don't remember for sure). Then I removed the rear element with a lens spanner (well I used a caliper to screw open the ring holding the rear element). I don't remember if it was the inside of this element or the next one that had the fungus but anyway I didn't have to dismantle the lens much further to clean it.
05-25-2010, 08:58 AM   #7
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thanks all above, some photoes to show me the setps will be more helpful?
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