To eliminate that possibility, I ALWAYS thoroughly clean both the front and back of each filter before placing or replacing it on the lens. Thus virtually eliminating the problem. Additionally, because I used the word "speck", don't assume I'm not including any offending debris such as "dust"...etc, etc, etc. I use coated filters, but my cleaning warning, as I'm sure you understood, was for those who would do harm to the lens element coatings.
Jack --- Godfrey DiGiorgi <[EMAIL PROTECTED]> wrote: > 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 > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
