thanks Jane
the lower left hand side of the image shows a hard to see green circle. I had a dust mote in my [OIII] data that my flatfield failed to remove.
There is also a gradient in each channel that runs diagonally from the lower left to upper right. This was caused by some vigetting in the optical train. I think I can fix or improve the two problems by another pass through the calibration and processing sequence with a better set of flats.
With the lousy weather that's been plaguing us since the beginning of the year I was just excited when I had the data captured. I my exuberance I sort of rushed it to "print".
----- Original Message -----
From: Jane Smith
To: Richard Crisp ; The Astronomy Connection
Sent: Wednesday, March 09, 2005 8:14 AM
Subject: Re: [TAC] Thor's Helmet from Castro Valley
At 06:55 AM 3/9/2005, Richard Crisp wrote:
I have a bit of a flat field problem so I will probably re-shoot the [OIII] flat and reprocess today or tomorrow.
Can you describe what characteristics of the image indicate there's a flat field problem? It looks great to me.
Jane
Received on Wed Mar 9 09:22:58 2005