--- Godfrey Digiorgi <[EMAIL PROTECTED]> wrote: > A speck of dust won't hurt anything. I am much more bothered by the thought of > taking a lens apart to clean a speck of dust and then reassembling it without > having a collimator handy to be certain that all the elements are properly > centered than I am by a speck of dust.
AKAIK, most manual focus Pentax lenses are rather simple in design and there are basically only 2 things to calibrate - the front and rear group distance & the focus. Everything else is pretty much fixed and determined by the precision of machining in the factory, including the optical axis. However, not all lenses have such design. The Tamron for instance, I have the impression that they are prone to misalignment because the optical axis is adjusted through a set of screws on the inner barrel. It is not uncommon for new SP28-75/2.8 has such issue out of box. Alan Chan http://www.pbase.com/wlachan __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
