--- Jim Hemenway <[EMAIL PROTECTED]> wrote: >This picture which I showed last week, was taken with my SMC >Pentax-FA 2.8 20mm... is this same lens about which you inquire? >http://hemenway.com/P-isDS/pages/FA20mm-IMGP0085sm.htm
Nice photo! An excellent, crisp feel to it. >Also... anyone... I have a bunch of screwmount Takumars and also >some F and FA autofocus lenses. I take it that the A and M are >for the bayonet mount Pentax cameras preceeding AF. Is that >correct? Yes. Bojidar Dmitrov will explain in greater depth: http://www.bdimitrov.de/kmp/ >..What's the difference between A and M as it would >pertain to my DS and my ZX5n? Regards the ZX-5n, I can't answer as I never owned one of them. Regards the DS, the A series lenses have all the electrical connections to the camera's metering system to allow all metering modes and patterns, control of the aperture via the body, etc. M lenses lack the electrical couplings. They can still be used on the DS with no problems, however. Meter patterns are limited to CW Averaging and Spot mode, and normally you use these lenses in Manual exposure mode. A custom function permits you to use the aperture ring rather than the body control, and the AE-Lock button operates to stop down the lens and perform a meter reading, sets the shutter speed from the reading. Aperture priority AE mode is also usable, but the camera will not stop the lens down: it operates at fully-open aperture only. Flash operation is similarly affected: since the DS only does P-TTL and requires the lens setting to be transmitted to the camera electrically, the flash operates at full power only and you set the exposure through the aperture ring. Whew, it's easier to use these things than to explain them... :-) Godfrey __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. http://promotions.yahoo.com/new_mail
