Actually. mine is an istD. *And*, I had it set to the mtf program mode. Still, it is strange that the camera would insist on f/2.4 at 1/30s with an FA50/1.7.
On normal program, it behaves more or less as Godfrey's list posted yesterday. j On 9/3/05, Godfrey DiGiorgi <[EMAIL PROTECTED]> wrote: > Interesting. > > Juan and I were looking at the *ist DS model, which has different > programming. > > Godfrey > > On Sep 2, 2005, at 5:26 PM, Herb Chong wrote: > > > on the *istD, there are four program curves. none of them except > > MTF depend on the specific lens. that means that all f2.8 lenses > > have the same curve in normal, high speed, and depth-of-field > > program modes. > > > > Herb... > > ----- Original Message ----- From: "Godfrey DiGiorgi" > > <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Friday, September 02, 2005 1:34 PM > > Subject: Re: Auto-selected shutter speed on istD/s--wrong? > > > > > > > >> Seems to me there are likely only a few Program curves. Seemed to > >> me that the shorter lenses stop the lens down a little faster, > >> once it starts to stop down, compared to the 135mm, although I > >> didn't go all the way and generate a set of graphs... I wonder if > >> the MTF data from the FA lenses is weighted into the curve too. > >> > >> The points at which aperture starts to close down seem about right > >> to me, although the F50/1.7 does seem a little low compared to > >> the relationship between the 35 and 135. > >> > > > > > > -- Juan Buhler http://www.jbuhler.com photoblog at http://photoblog.jbuhler.com
