You are, of course, right, John. What bothers me, is that the camera actually does stop down when fired as described, but aparently to late. I guess it would have been quite simple (small ajustments) to turn the green button into a temporary shutter release, using a custums function and perhaps one small electronic contact. All the best. Jens
Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: John Francis [mailto:[EMAIL PROTECTED] Sendt: 8. september 2004 19:12 Til: [EMAIL PROTECTED] Emne: Re: Amazing Discovery (was: IST D and Pentax-F 1.7x AF adapter) Jens Bladt mused: > > With the AF 1.7x adapter on the *ist D, an A or M lens works in Green Mode, > P-Mode, Tv-Mode and Av-mode (works like aperture priority in all cases) - > without using the greene button. I just tried on f2.8, f8 and f22. All 12 > images came out correctly exposed! > > That's kind of sensational, isn't it!? > All the best > > Jens Bladt It's more than sensational - it's impossible. An "A" lens (set at "A") should work correctly, as you describe. But there's no way for the camera to reliably achieve correct exposure with a pre-"A" lens at anything other than full aperture. So that's what it uses. If you examine those image you took with the lens set to f22, you'll find they have the same depth of field as images exposed with the lens at f2.8 With a pre-"A" lens mounted (with or without the AF 1.7x adapter), and the camera set to any of the "Auto" modes, the top panel display will show Av. But when the exposure is made, the lens won't stop down. The only time tha *ist-D will stop down a pre-"A" lens during exposure is if the camera is set to manual exposure mode.
