[AZ-Observing] Re: ADU
- From: Chris Schur <comets133@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sat, 10 Sep 2011 16:14:47 -0700 (PDT)
Stan, ADU's are the actual bits from the A/D converter. For a 16 bit camera,
that means 0 - 64,000 or so. But since the background in the darks is like 400
or something, you subtract that out after calibration and the blacks become
close to 0.
Clear Skies,
Chris
Schur's Web Portal: http://www.schursastrophotography.com
--- On Sat, 9/10/11, Stan Gorodenski <stanlep@xxxxxxxxxxxxx> wrote:
From: Stan Gorodenski <stanlep@xxxxxxxxxxxxx>
Subject: [AZ-Observing] ADU
To: "AZ-Observing" <az-observing@xxxxxxxxxxxxx>
Date: Saturday, September 10, 2011, 3:18 PM
Maybe you imaging experts can help me out. When I go into CCDSOFT and
bring up an image and run the mouse cursor across the screen, in the
lower left corner are intensity values that change as the mouse moves.
Are these ADU's? If I then dark subtract the image, in this case a
spectrum, the intensity values in the lower left of the screen are about
4 times higher, indicating to me that CCDSOFT is rescaling things and
displaying rescaled intensity values. How do I get an image with ADU
values that are directly related to saturation values of the camera?
Stan
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