I don't know much if anything about reassembling lenses, however, a very well reputed technician in SoCal that I've used always checks the lenses he repairs on a with a collimator after cleaning and reassembling. Is it necessary? I don't know, but it sure makes me feel good to know that he's checked and adjusted everything he can.
Plus, Alan Chan's comment, "AKAIK, most manual focus Pentax lenses are rather simple in design and there are basically only 2 things to calibrate ..." is filled with qualifiers (AFAIK, most, basically), and I'd never trust a comment like that to be definitive. This is not to take anything from Alan's experience and expertise, such as it may be ;-)) Shel > [Original Message] > From: Godfrey DiGiorgi > Small adjustments to thread seating are made by technicians hand > assembling a lens. The guy who does repair work for me always checks > with a collimator after cleaning a lens and reassembling it, and I > trust his judgement as I do not repair optical assemblies myself.
