If there is a goodly amount of dust inside the lens, it will not be as sharp or as contrasty as it would if it were clean. The difficulty is finding someone competent to do a CLA and reassemble the lens properly. It's not simple with modern lenses, with older lenses it's easier. Of course, it's also pretty expensive to have it done right ... locally, they charge about $80 per hour for labor and have a 1 hour minimum.
In the US, the people I've entrusted with work like this is John Van Stelton Focal Point, Inc 1017 South Boulder Road, Suite E-2 Loiseville CO 80027 USA 303-665-6640 http://www.focalpointlens.com/ as well as the local tech in Mountain View, CA : Fred Mueller International Camera Repair 720 Villa Street Mountain View CA 94041 USA 650-961-5825 [EMAIL PROTECTED] Godfrey On Apr 17, 2007, at 2:57 PM, Pawel Bartuzi wrote: > Hello, > > What is your opinion on lens cleaning? I mean not the usual > cleaning but > professional cleaning involving taking the lens apart and cleaning all > of it's surfaces? > > I ask this question because I have several K primes which are now > about > 30 years old and although the pictures made with them are nice, when > inspecting the lens with strong flash light I can easily see > amounts of > dust sitting on all of the internal surfaces. On some of the lenses, > like SMC K 18/3.5 - where there are 12 elements in 11 groups - I can > imagine it does affect the image quality (and indeed, the lens is soft > on the edges of the frame). > > I wonder whether thorough cleaning of the lens done by a professional > does improve such lens performance by a significant margin? Does it > raise or lower the lens value? What is your opinion, your experience? > > Pawel > > ______________________________________________________________________ > ______ > Domena za 90 groszy! > www.nazwa.pl > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
