Peter, Automation is defeating you from getting to F1.4 on the lens. To Perry's point, the MTF thinks F1.4 is 'not so sharp' so it goes ahead and changes the ISO to help you. I just had the revelation trying to make Share Reduction kick-in. Shooting at 1/45th and wide open at F5.6, I changed the aperture to F11 - still 1/45th, then to F13 - still 1/45th. Then, I noticed the ISO of the shots I took had changed. The camera tried to help me out! (OK actually, once you know that's what it is doing.) Regards, Bob S.
On 12/2/06, Perry Pellechia <[EMAIL PROTECTED]> wrote: > On 12/2/06, Peter Loveday <[EMAIL PROTECTED]> wrote: > > > * The MTF programme line still refuses to use all apertures on my primes > > (ie, no F1.4 on the FA50/1.4) > > > > That's what MTF prog. should do. It is choosing the aperture based on > what gives the better (i.e., sharper) result. The MTF value for F1.4 > is low so the camera it is going to avoid this setting and stop the > lens down for a sharper result. If you want the camera to include > F1.4 then switch out of MTF based prog. > > Perry. > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
