Hello J.C. O'Connell It's an M lens. Meaning manual setting the aperture - F.5.6- f 45. It's a spring aperture, so I still have open aperture fokusing. No electrical contacts like an A-lens. Manual focus too. I use it utilizing the "green button" for measuring light (no open aperture metering). If I use it with my 1.7x AF converter I get 680mm and Auto Fokus.
I own many M-lenses and a few K-lenses. (M stands for Compact Designs - meaning lightweight and rather small). Regards Jens -- Treat others as you would like to be treated yourself. On Oct 19, 2010 18:18 "J.C. O'Connell" <[email protected]> wrote: > Is the aperture automatic or manual? > the old screwmount and early K mounts > were manual. > > -- > J.C. O'Connell (mailto:[email protected]) > Join the CD PLAYER & DISC Discussions : > http://tech.groups.yahoo.com/group/cdplayers/ > http://launch.groups.yahoo.com/group/cdsound/ > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Jens > Sent: Tuesday, October 19, 2010 11:38 AM > To: Pentax-Discuss Mail List > Subject: Enablement: SMC Pentax-M 1:5.6 400mm > > > I just got one of these old Pentax-M lenses from Germany/Ebay at a > resonable > price - appr. 380 USD/272 Euro. > > It's very nice - and quite close to "like new" - except for the > leather > case. I did some tests agains my "doggy" Sigma DG 135-400mm. Actually, > the > Sigma seems to be sharper at f. 5.6, but the Pentax 400mm improves > significantly at f. 11 - f. 16. > > I am a bit disappointed with the sharpness fully open. I guess I > should make > some more test in better light, with faster shutter speeds. I'll let > you > know. > > Se some of the test shots here: > http://www.flickr.com/photos/bladt/sets/72157625198204652/ > > Regards > Jens > > > > -- > Treat others as you would like to be treated yourself. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
