Re: istDs - what a great camera!

[Gonz]

Unfortunately its locked to the EV setting at the time you pressed the 
button.  I don't know why they didn't go one step further and allowed a 
more versatile Av mode while they were mucking with the firmware.  I am 
sorely tempted to see if I might be able to do it myself.  Someone 
posted the uP type used in the camera and I downloaded the instruction 
set and OS layout.  I might try it even if I have to hand assemble it. 
I've done it before and its not that bad once you get into it.

J. C. O'Connell wrote:
That's sounds correct. Does the *istD readjust
shutter speed if the subject brightness changes or is it locked 
to whatever speed the reading was when the green button
was released?
jco

-----Original Message-----
From: Gonz [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, September 21, 2004 12:50 PM
To: [EMAIL PROTECTED]
Subject: Re: istDs - what a great camera!

J. C. O'Connell wrote:

With the ist D mode you need to re-meter every time you change the 
aperure setting not only to shoot but to even see what the shutter 
speed is going to be. NOT AS GOOD as if they had K/M sensing.

I think it is possible.  For a particular scene if you have an EV 
reading X1 at an unknown aperture when pressing the green button, and an

EV reading X2 wide open, then if you change scenes, you can estimate the
new speed needed to properly expose the pic by taking the new wide open 
reading of X3 and assuming that the same relationship holds between 
X1-X2 as it does between X3-X4, where X4 would be the EV at the same 
aperture you had before.  While you dont know the actual aperture, you 
at least know it relative to the wide open aperture.  They could do this

in the firmware and have a true AE (Av) mode if they wanted to with K/M 
lenses.  The only time you would have to press the green button again is

if you manually changed the aperture again.
rg