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Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Alan Friedman

January 12, 2007 10:10 PM Forum: CCD Imaging and Processing/Solar System

Another Comet McNaught shot

Posted By Alan Friedman
Hi Jeff -

These came out really well - thanks for sharing them.

Alan

January 12, 2007 10:14 PM Forum: CCD Imaging and Processing/Solar System

Jupiter + Oval BA, Jan 11 2007 1811UTC

Posted By Alan Friedman
Hi Anthony

Anthony Wesley said:

...and it was followed today by our 2nd hottest day ever - 40.5C. Yowzers!


Serves you right for holding summer in the winter! 8)

The features can be seen well even in the blurring effects of the atmosphere and the color is excellent. I look forward to the nice pictures you guys will post from down south.

best -
Alan

January 14, 2007 05:20 PM Forum: CCD Imaging and Processing/Solar System

High Res. Alphonsus-Arzachel-Ptolemaeus-Mosaic

Posted By Alan Friedman
Hi Wes -

Great to see these images stitched together. The detail and quality of image at this scale is unlike anything I have ever seen - just extraordinary.

I hope you weeather the storm without too much damage and hardship. It's expected here too, but not as severe.

best -
Alan

January 15, 2007 11:14 PM Forum: CCD Imaging and Processing/Solar System

Saturn this morning

Posted By Alan Friedman
Hi Jim -

Really nice - I think the color on this version is much better.

best -
Alan

January 15, 2007 11:18 PM Forum: CCD Imaging and Processing/Solar System

Lunar: Archimedes

Posted By Alan Friedman
Hi Anthony -

You've captured some great detail - excellent!

best -
Alan

January 16, 2007 11:18 PM Forum: CCD Imaging and Processing/Solar System

Mare Undarum Domes?

Posted By Alan Friedman
A great image, Stefan - those swells certainly look domish to to me.

best -
Alan

January 20, 2007 09:31 PM Forum: CCD Imaging and Processing/Solar System

Saturn 1/20 AM

Posted By Alan Friedman
Hi Greg -

Nice image.

[First time trying Registax v.4. Opinions on multiple vs. single point alignment for Saturn? If multi, how many, and what points do you pick?

Sharpness variations across the field from turbulence give an advantage to performing alignment on multiple regions. The improvement gained by multiple alignments increases with the size of your chip (or in this case, the amount of the chip used in your image, hence, the focal length used). The improvement becomes less significant as the quality of the seeing improves. At this image scale and in 8-9/10 seeing I would say it is not going to give much, if any improvement. At f40 in 5-6/10 air you will see an increase in sharpness of the cassini division if you align the image on each ansae. This is typical for my set-up and location - I often perform 4 alignments - right and left and south and north.

hope that helps -
Alan

January 21, 2007 09:19 PM Forum: CCD Imaging and Processing/Solar System

Arctic Saturn

Posted By Alan Friedman
Excellent, Ed! - you've processed it beautifully too. Certainly among the nicest saturns I have seen this year.

I saw the same temperature on the thermometer in my backyard last night. I wimped out and opted to work on some saturn data captured at a balmy 19 degrees a few days before. I don't think it will come out this good though.

best -
Alan




January 22, 2007 03:27 AM Forum: CCD Imaging and Processing/Solar System

Saturn from Lostock NSW Australia, 19th Jan

Posted By Alan Friedman
Hey no fair - you get seeing like this and the comet too?!

Just a gorgeous image, Anthony.

Alan

January 25, 2007 12:03 AM Forum: CCD Imaging and Processing/Solar System

windy saturn

Posted By Alan Friedman
Hi and thanks for sharing comments on this saturn. I hope we all have a good opportunity to catch it in a still moment around opposition.

best wishes -
Alan

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