68355Re: [ccd-newastro] New to CCD Astrophotography: Master Dark/Master Bias?
- Oct 25, 2010Would not a dark frame already have bias data in it?
----- Original Message -----
From: "Douglas B. George" < dg @...>
To: ccd-newastro@ yahoogroups .com
Sent: Monday, October 25, 2010 2:26:47 PM
Subject: Re: [ccd-newastro] New to CCD Astrophotography : Master Dark/Master Bias?
On 2010-10-25 11:43 AM, Neil Fleming wrote:
> * The sources I've read suggest subtracting the bias frame from each dark
> sub-frame before combining them. But couldn't I combine, then subtract just
> once? Or is there a quirk of the algorithm that makes that a bad idea?
That's a REALLY bad idea. Not because of any quirk, but because MaxIm DL
handles that automatically. Doing it manually will probably result in it being
done TWICE, which would be bad.
The Set Calibration command is designed to handle everything automatically.
Just dump in all of your calibration frames and let it figure out the details.
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