> In that case you should turn off auto-ISO, and/or take the camera > off the MTF program setting. The engineers haven't decided that > 1/15 at F2 is better than 1/30 at F1.4; they have just provided > a program line which will allow you to declare that MTF is the > most important thing. But only if you select that program line. > > Complaining that MTF won't use the widest aperture is about as > sensible as complaining that Tv won't adjust the shutter speed. > > MTF, like Av, Tv and Sv, is just one of the tools available. > It isn't a universal panacea - it's just one form of automation. > You have to know how it will behave, and choose the right tool; > expecting the camera to think for you is unrealistic. > There are other program lines that don't use MTF; when you are > shooting in low light, and care more about shutter speed than > the resolving power of the lens, you should use one of them.
Well, I disagree with some of that. I understand what you're saying, but it seems to make the assumption that choosing MTF is telling the camera to always use the sharpest aperture for a given lens. That is clearly not how it operates. It *does* already make a choice as to which shutter speed / aperture combination is best; it *will* drop the aperture to less-than-ideal sharpness values in order to keep a reasonable shutter speed, yet it arbitrarily chooses not to go to f1.4. Anyways, like I said, I obviously just have a different opinion on what would be better in my use to others here, and thats fine... I;m not after an argument about it, so this will be my last post on the subject. - Peter -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
