[Leica] RE: Mark Rabinor and his wonderful new exposure mode

[dorysrus at mindspring.com (Don Dory)]

Felix,
You are exactly correct that most if not all of the P&S digicams have an
"auto" setting for film speed.  My problem with that is that I can not
lock in a specific shutter and aperture that is meaningful for exposure.
In manual, the ISO doesn't change to give me a correct exposure.

What I was interpreting Mark to suggest is that just as in "aperture
priority" the aperture and ISO are fixed with the shutter speed
floating: in ISO priority, I can fix the shutter speed and aperture and
the ISO floats within the limits of the camera to hold the same
exposure.  You would need some mapping of the chip to take care of
non-linearity issues; but the ability to hold a specific exposure with
viewfinder information regarding the ISO would be extremely valuable to
me in some specific photographic occasions.

Don
dorysrus@mindspring.com

-----Original Message-----
From: lug-bounces+dorysrus=mindspring.com@leica-users.org
[mailto:lug-bounces+dorysrus=mindspring.com@leica-users.org] On Behalf
Of Felix Lopez de Maturana
Sent: Thursday, April 29, 2004 1:30 PM
To: lug@leica-users.org
Subject: [Leica] RE: Mark Rabinor and his wonderful new exposure mode


>I think maybe Mark has hit on a truly marvelous idea for digital.  Auto
>iso: photographer sets the shutter and aperture and the camera sets the
>appropriate ISO based on users defined limits on the histogram.
>
>There could be real money in this.
>
>No, I am not being cute.  How many times have we all fought to hold F1
>or F1.4 with a decent shutter speed.  How many times have we wanted a
>certain aperture to hold specific details in focus and exclude others
>but didn't want to drag a tripod two miles up hill so we could use the
>inevitable slow shutter speed.  With digital, there are many fewer
>compromises with higher ISO's.
>
>Don


But Mark & Don, doesn't this already exist? Not in pro DSLR but in
advanced
p&s digital cameras. Any of the happy users of the Digilux cameras may
check
if they have this? I think so. You set in manual the diaphragm and the
speed
and, then, in the menu for ISO setting in AUTO mode, the camera will set
the
necessary ISO -of course in the range of possibilities of the camera,
lets
say 65-800, for an appropriate output. Tonight I'll check it but I think
it
works like that. I only use 64 ISO for avoiding noise and if the light
is
poor I use the flash.

It would be a fine idea if the DSLR, including the R8 digital back, will
have this feature.

Felix

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