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Captured by
Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Alan Friedman

October 1, 2005 04:12 PM Forum: CCD Imaging and Processing/Solar System

Aristoteles and Eudoxus

Posted By Alan Friedman
It looks great on my laptop - very nice processing.

Alan

October 2, 2005 04:01 PM Forum: CCD Imaging and Processing/Solar System

5-inch Mars 09/30

Posted By Alan Friedman
Hi Ron -

I think you are using all 5" inches here! Is it time for more firepower aperture wise? Nice work -

Alan

October 3, 2005 05:42 PM Forum: CCD Imaging and Processing/Solar System

Mars in IR (Infinity camera)--again

Posted By Alan Friedman
Hi Mike -

Nice work! If you have a red filter, try it too. In decent seeing it has been my experience that the red images will be sharper than IR.

best,
Alan

October 3, 2005 05:46 PM Forum: CCD Imaging and Processing/Solar System

Longomontanus

Posted By Alan Friedman
Hi Wes -

That is simply stunning. I wish I had a backlog of streams like that! Actually, I would be happy to have one stream like that... I would savor processing it.

It is always a treat to see your beautiful work - thanks for posting it here.

Alan

October 3, 2005 05:53 PM Forum: CCD Imaging and Processing/Solar System

Early Saturn

Posted By Alan Friedman
Fantastic saturn, Ed - a pleasure to see it.

best,
Alan


October 3, 2005 05:57 PM Forum: CCD Imaging and Processing/Solar System

One of "Those" weekends

Posted By Alan Friedman
Hi Jim -

It's a beautiful image nonetheless - well promised and a great representation of mars on a less than perfect night. I am sitting out there in spirit with you - waiting for that perfect night!

cheers,
Alan

October 3, 2005 06:02 PM Forum: CCD Imaging and Processing/Solar System

Eclipse from Ghent, the relaxed way

Posted By Alan Friedman
dominique dierick said:

And here is one of the snapshots (double exposure, one for the sun, one for the fountain):

http://www.astronomie.be/dodi/eclips.jpg
i

That is quite an image - an unusual perspective on the eclipse. Beautiful!

Alan


October 5, 2005 12:01 AM Forum: CCD Imaging and Processing/Solar System

Mars RGB 2005/10/4 Richard Bosman

Posted By Alan Friedman
Ditto to the other comments, Richard - a wonderful image!

best,
Alan

October 5, 2005 04:51 AM Forum: CCD Imaging and Processing/Solar System

Mars and Saturn

Posted By Alan Friedman
Hi Paul -

Nice work! I especially liked the saturn image.

Alan

October 5, 2005 01:43 PM Forum: CCD Imaging and Processing/Solar System

Mars Monday AM

Posted By Alan Friedman
John Biretta said:

I have been wondering if the ringing at the edge was partly
due to the large central obstruction in these SCTs. Perhaps
it is a manifestation of the bright first Airy ring?
Processing seems to pick-up on it and further accentuate it.
Comments?

I think the effect of CO would be to reduce the contrast in the image as in at the eyepiece - this artifact comes from too much contrast - usually applied in unsharp masking. If you experiment with this processing tool you can see the effect it has on the following edge of mars. The larger the pixel radius used the more dramatic the increase in contrast - the albedo features respond OK to using a larger pixel diameter because they are low in contrast to start with, but unfortunately the bright limb doesn't accept this as well.

Nicely done image!

Alan

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