The thing is, Jack, that a couple of bits of dust on the front element of a lens does *nothing* to affect image quality in any significant way. (Those same specs on the *rear* element can have an impact, depending upon the lens.)
A fine layer of dust between the front element and the back of the filter, however, does cut sharpness and flare resistance substantially, and is often quite difficult to see unless you remove and wipe the filter. Godfrey On Apr 23, 2007, at 9:26 AM, Jack Davis wrote: > That certainly is "a curious thing". I'm overly "speck" vigilant and > rarely need to remove a filter to puff one away. If I do see a > speck on > the lens, I assume it drifted in while I was changing filters. > I try to be quick about changing filters and now, in changing > lenses on > the K10D. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
