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Dirty Lenses

I am the proud new owner of a TDC Model 116, with TDC Matched Tridar 
Proj. Lens, 5" f3.5 Coated Anastigmat. Boy, is that a heavy-duty unit! 
Everything seems to be working, but the projection lenses are dirty (on the 
inside), and one seems to have some moisture, which condenses on the inside 
of the lens after a few minutes of use.

I have inscrewed the plastic lens holders from the projector, but I don't see 
anything that screws out to get to the insides. Does anyone have any 
suggestions about taking the assembly apart and cleaning (and hopefully 
putting it back together)? Or is this something I should definitely leave to a 
professional? Since I only paid $20 for the projector, I hate to pay someone 
$100 to clean the lenses.

Thanks in advance,
Jeff Jessee


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