As you stated, the lens focuses just fine with an empty filter port. I found no plain glass filter when purchased new. Would, also, seem logical for such to have been referenced in the user's manual.(?) The filters you mentioned may be UV/daylight.(?)
Jack --- John Francis <[EMAIL PROTECTED]> wrote: > > Really? Both my A* 300/f2.8 and my FA* 250-600/f5.6 came with a > set of drop-in filters (albeit different sizes for each lens) that > included what appears to be a plain glass filter. I'm pretty sure > it's recommended practice to have a piece of glass in the optical > path there - why else would there be a filter blank included? > > Sure, the lenses will focus just fine without anything there. But > presumably the CA corrections, etc., assume a filter is present. > > > On Mon, Apr 03, 2006 at 06:32:50AM -0700, Jack Davis wrote: > > Nor my A*300 f/2.8. > > > > J > > > > --- Rob Studdert <[EMAIL PROTECTED]> wrote: > > > > > On 3 Apr 2006 at 6:57, mike wilson wrote: > > > > > > > One or two lenses (300/2.8?) require a filter "blank" (filters > at > > > the back of the lens) to focus properly in the first place. > > > > > > Not in the A*300/2.8 or any other of the long "recent" Pentax > lenses > > > that I'm > > > aware of. > > > > > > > > > Rob Studdert > > > HURSTVILLE AUSTRALIA > > > Tel +61-2-9554-4110 > > > UTC(GMT) +10 Hours > > > [EMAIL PROTECTED] > > > http://members.ozemail.com.au/~distudio/publications/ > > > Pentax user since 1986, PDMLer since 1998 > > > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam protection around > > http://mail.yahoo.com > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
