Bode's Galaxy M81Posted By Thomas V Davis |
Truly magnificent!!
Tom
Tom
Posts Made By: Thomas V Davis
February 26, 2006 04:16 AM
Forum:
CCD Imaging and Processing/Deep Sky
February 26, 2006 10:43 PM
Forum:
CCD Imaging and Processing/Deep Sky
Horsehead H alphaPosted By Thomas V Davis |
Isn't H-alpha amazing? Beautiful!
Tom
Tom
March 4, 2006 03:40 AM
Forum:
CCD Imaging and Processing/Deep Sky
M-101 - Definitely a Work in ProcessPosted By Thomas V Davis |
Really nice Mike! What new scope pray tell?
Tom
Tom
March 6, 2006 06:50 PM
Forum:
CCD Imaging and Processing/Deep Sky
NGC 4236Posted By Thomas V Davis |
Love that Traveler!
Tom
Tom
March 8, 2006 02:39 PM
Forum:
CCD Imaging and Processing/Deep Sky
Leo Trio - LRGBPosted By Thomas V Davis |
Nice!
Tom
Tom
March 10, 2006 11:01 PM
Forum:
CCD Imaging and Processing/Deep Sky
A couple of Messier Open ClustersPosted By Thomas V Davis |
Clusters are overlooked for the more "sexy" objects, which is a shame. Your images are wonderful -- like looking through a scope.
Tom
Tom
March 13, 2006 03:02 AM
Forum:
CCD Imaging and Processing/Deep Sky
Thor's HelmetPosted By Thomas V Davis |
Jim,
It did come out good! Nice overall color and detail!
Tom
It did come out good! Nice overall color and detail!
Tom
March 13, 2006 08:57 PM
Forum:
CCD Imaging and Processing/Deep Sky
Making a Comet MoviePosted By Thomas V Davis |
Thanks for the tutorial Dennis.
Tom
Tom
March 13, 2006 09:51 PM
Forum:
CCD Imaging and Processing/Deep Sky
NGC 4565 - LRGBPosted By Thomas V Davis |
Very nice!
A note on the blue rims on your stars. Even images from the best corrected triplet APOs can have stars with blue rims. It isn't always CA (chromatic aberration). One mistake some imagers make is that they do not re-focus often enough. If your scope has a short focal length then the critical focus zone can be very small. A small drop in ambient temperature can easily take you out of the focus zone for your telescope. I use an AP 155EDF f/7 and it is color corrected to near perfection. However, if I don't re-focus before each filter change then I can get blue rims on my stars as well. Some imagers advocate re-focusing every 30-60 minutes depending on the drop in temp. I use a Robofocus and FocusMax to automate the process. Also, parafocal filters are not always as parafocal as they could be.
So, if you don't already, try re-focusing before each filter change and see if that reduces your blue rims.
Best,
Tom
A note on the blue rims on your stars. Even images from the best corrected triplet APOs can have stars with blue rims. It isn't always CA (chromatic aberration). One mistake some imagers make is that they do not re-focus often enough. If your scope has a short focal length then the critical focus zone can be very small. A small drop in ambient temperature can easily take you out of the focus zone for your telescope. I use an AP 155EDF f/7 and it is color corrected to near perfection. However, if I don't re-focus before each filter change then I can get blue rims on my stars as well. Some imagers advocate re-focusing every 30-60 minutes depending on the drop in temp. I use a Robofocus and FocusMax to automate the process. Also, parafocal filters are not always as parafocal as they could be.
So, if you don't already, try re-focusing before each filter change and see if that reduces your blue rims.
Best,
Tom
March 25, 2006 06:52 PM
Forum:
CCD Imaging and Processing/Deep Sky
new scope arrivedPosted By Thomas V Davis |
next image
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