Ah, thanks for the correction. I guess I was thrown off by the
subject line, which said "istD/s". ;-)
Godfrey
On Sep 3, 2005, at 11:55 AM, Juan Buhler wrote:
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
