But Godfrey, you're forgetting sunspots. It's clear (to me at least)
that sunspots have much more effect on the grosser electronics than
they do on chemical interactions!
(going back under the lead foil umbrella now.. Ta Ta!)
At 10:43 AM -0700 7/27/05, Godfrey DiGiorgi wrote:
Sigh. The way electrons and circuitry interact is *at least* as
stable and predictable as how chemical compounds and photons
interact. Indeed, the way that chemical compounds and photons
interact is *due* to how electrons interact.
To the original problem:
If you are in stable light conditions and the exposure should be
unchanging, a good test is to simply set the camera to manual
exposure and see if the exposures vary. Most likely, they will not.
It's the particular way a specific camera reacts to what's in front
of it, how long it takes to react, and other dynamics of your use
that throw the frame-by-frame exposure off in most cases. In the
case of the Pentax SLR cameras (including the DSLRs) the mechanical
precision of the aperture setting mechanism internal to the body and
lens is a bit variable, frame by frame, which causes some small
variation in exposure ... has nothing to do with whether the capture
medium is film or digital sensor.
Godfrey
On Jul 27, 2005, at 8:28 AM, Shel Belinkoff wrote:
Dave ... it's digital photography - whoops, image capture. Do you expect
rational explanations for the way all the electrons and electronic bits
interact with one another? Just think of the problems various "operating
systems" have had in the past, and still have. Why should you expect more,
or more logic, from your camera?
Just a suggestion - can you shoot in all manual mode, setting the ap and
the shutter. As long as the light doesn't change much you should get more
consistent results.
Shel
[Original Message]
From: <[EMAIL PROTECTED]>
I get the same thing if I am shooting too fast, especially with jpegs.
I think the sensor is overheating (not per se, but I do think it is a
flaw
in the capture device when it is too busy).
William Robb
Possible, but with these i'm just shooting a fence about every 20-30
seconds,1 shot,no
rapid fire.
--
Alan P. Hayes
Meaning and Form: Writing, Editing and Document Design
Pittsfield, Massachusetts
Photographs at
http://www.ahayesphoto.com/americandead/index.htm
http://del.icio.us/ahayes
