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Roger Cicala | all galleries >> lenstest >> This is a 17-55 that had the internal dust magnet syndrome > frontelementout.jpg
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Of course I had to. The three small screws remove easily but I was pleased to have some surgical forceps to pick them up with. With those out of the way I carefully turned the lens upside down into my palm and the front glass slide right out. Its a fairly thick piece of glass. As you can see this area is where the dust was living. A few puffs with a blower and it was clean. A few more and a quick brush on the back of the front element took care of it.
When I put the element back in rotating it counter clock wise produced a noticeable 'thunk' when the element seated properly. The screws went back in without a hitch and the seal replaced with a little adhesive.

Canon EOS Digital Rebel XTi
1/125s f/5.6 at 40.0mm iso800 full exif

other sizes: small medium large original auto
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Tim 02-Nov-2008 15:03
What kind of adhesive do you use? Rubber based just in case you wanted to pull the front seal off again?