From: Mike Unsold (mike_at_antispamdomain.not)
Date: Wed Jun 25 2003 - 19:56:50 EDT
Oops ... Should read without noticeable difference between images
Mike
>>
I have grown attached to the 1Ds and could not possibly part with
it even for a moment. But the real test is in use and the 10D
performs very well. The "heat up" problem is something to be aware
of so you can compensate. I can say from direct experience that the
1DS can take 45 5 minute exposures at ISO 500 followed by another 9
dark frames all with noise reduction running in parallel with
noticible difference between images. Here is the stack of 45
calibrated images:
http://www.mlunsold.com/examples/1DS/1Ds-M101.html
The beautiful stack of 90 images of M57 by Mark is an example
of how well the 10D can perform.
I would be great if you could think of a way to control the heat
build up without damage to the camera.
Mike
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
I am making a preliminary comment only on the heating problem
mentioned at the
end of this post. I am doing some careful measurements on 10Ds right
now. One
data point with one camera really astonished my.
When the 10D is on, but not exposing it draws 110 ma from the 7.4
volts source.
This is a power dissipation of 0.814 watts. When the D10 is exposing
it
draws an astonishing, to me at least, 370 ma. This is a power
dissipation in
the camera of 2.74 watts. The later figure is a lot of power to heat
the
camera. It is the same power as a small night light. I found this
hard to
believe, but the measurements are firm. I do not know where within
the camera
the heat is dissipated, but in the long run, it heats the entire
camera body.
I am surprised by the comment about the 1Ds not heating up. (In fact,
I have
doubts about this) If you will send me your 1Ds, I will check this
out for
you. (VBG)
The power dissipation and consequently heating of the camera is
verified in
some of the data I am now preparing for posting later today.
Doc G
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