Interesting. But I wonder if, for example a 300mm lens with a 1.4 converter, should have the SR set for a 300mm lens or 420mm (1.4 X 300) lens ?
Any thoughts? Kenneth Waller ----- Original Message ----- From: "Godfrey DiGiorgi" <[EMAIL PROTECTED]> Subject: Re: The need to manually set SR > On Feb 1, 2007, at 4:47 AM, John Whittingham wrote: >>> It's in the menus. I think in custom functions. But if you mount the >>> lens and turn SR on before turning the camera on, the SR >>> adjustment screen will appear when you turn the camera on. Just set >>> it to 600. I've set it to 800 with my 400 and 2X converter. Works >>> nicely. >>> Paul >> >> >> Ah now, is that an A series lens, or A series converter? Because >> it's not >> working with AF lenses and AF converter, it's just transmitting the >> lens >> data straight through and setting SR automatically, with no option >> in the >> menu structure to change SR, it's 'greyed out' so to speak! > > > If the lens fitted supplies the focal length data, I don't believe > there is any way to override the setting. That includes the lens plus > teleconverter. > > Pentax-A Rear Converters do not supply the focal length data so you > can set it manually. That's the only one I have. However, this topic > came up on DPReview.com and one person posted his experience with the > Pentax-F 1.7AF adapter and the Sigma 2x APO TC ... > > thread link: > http://forums.dpreview.com/forums/read.asp? > forum=1036&message=21831766 > ----------- > Forum DPReview.com "Pentax SLR Talk" > Subject Re: Teleconvertors & anti-shake focal lengths > Posted by McBrian [CLICK FOR PROFILE] > Date/Time 6:44:59 PM, Saturday, January 27, 2007 (GMT) > > > > Hi all, haven't digested all of the thread, so sorry if I'm repeating > anything, hope some of this may be of interest. > > I just received a Pentax 1.7x AF Adaptor today, got for a very very > nice price and it's in as new condition too. I already have a Sigma > 2x APO so I wondered how the K10D SR and EXIF differs between them, > well here are a few quick conclussions. > > Penatx SMC-F 1.7X Adaptor > When you mount an SMC-A lens to a Pentax-F 1.7x adaptor you are > promted at switch on for the focal length, with the SMC-A50 f1.4 > mounted the adjusted aperture of f2.8-40 is selectable/displayed in > VF and EXIF, the EXIF also displays the focal length selected in the > SR menu. MF is lit in the VF even though AF is selected, the lens > does AF though. > > When you mount an F/FA/DA lens to a Pentax-F 1.7x after switch on you > can set the desired focal length by going into the Shake Reduction > menu and select whatever focal length you wish, with the DA16-45 f4 > mounted the adjusted aperture of f6.7-40 is selectable/displayed in > VF and EXIF, the EXIF also displays the focal length selected in the > SR menu. MF is lit in the VF even though AF is selected, the lens > does AF though. > > Sigma 2x APO > When you mount an SMC-A lens to a Sigma 2x APO TC you are promted at > switch on for the focal length, with the SMC-A50 f1.4 mounted an > aperture of f1.4-22 is selectable/displayed in VF and EXIF. No > corrections to Aperture but the focal length selected is displayed in > the the EXIF. MF is lit in the VF even though AF is selected. > > When you mount an F/FA/DA lens to a Sigma 2x APO TC after switch on > you cannot set the desired focal length, the Shake Reduction menu is > greyed out, with an FA24-90 mounted the aperture range as stated on > the lens is selectable/displayed in VF and EXIF, No corrections to > Aperture or focal length in VF or EXIF > > If you switch on with only the Sigma 2x attached you are promted for > a focal length but this is over ridden as soon as you attach an AF lens. > ----------- > > So behavior will differ based on the teleconverter and the primary > lens fitted. > > Godfrey > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
