Actually I just tried it and it focused quite well. It seems that f/2.8 is what the accepted minimum is for the 1.7x and yet Pentax has the A35-105/3.5 on their "approved" list for the 1.7x. I've found that f/4.0 lenses work fine as long as their contrast is good and the lighting is adequate. You're right about the tripod though, that's 510mm on film and 765mm (equiv) on the D! I did manage a few acceptable shots at f/4 but the sharpness is pretty poor.
Don > -----Original Message----- > From: Herb Chong [mailto:[EMAIL PROTECTED] > Sent: Wednesday, June 22, 2005 6:25 PM > To: [email protected] > Subject: Re: TCs on digital > > > F4 means you're in manual focus mode and probably tripod too > because of slow > shutter speed. > > Herb.... > ----- Original Message ----- > From: "Don Sanderson" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, June 22, 2005 5:16 PM > Subject: RE: TCs on digital > > > > John I didn't see your original post but that's a fantastic shot! > > I'm about to try the 1.7x on the SMCP 300/4 and see how it does. > > Works great on my ATX 300/2.8 but that's a "tripod only" combo! > > <grunt> > >
