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VdB 141 Ghost Nebula

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Posts Made By: Roland Christen

January 26, 2005 03:16 PM Forum: CCD Imaging and Processing/Solar System

Rosette close-up

Posted By Roland Christen
>>I like to share a recent image of the Rosette, taken with the STL11k and a 16" cassegrain in primefocus (Ha-R-G-B). >>

Is this a Classical Cassegrain?

Roland Christen

January 27, 2005 12:46 AM Forum: CCD Imaging and Processing/Solar System

Rosette close-up

Posted By Roland Christen
Here are two views of the Rosette taken with smaller instruments by John Gleason:
http://www.celestialimage.com/page196.html
http://www.celestialimage.com/page164.html

January 29, 2005 07:38 PM Forum: CCD Imaging and Processing/Solar System

Plato in shadow

Posted By Roland Christen
What causes the ringing at the edges of the shadows? Was it the type of processing?

Roland Christen

February 3, 2005 12:12 AM Forum: CCD Imaging and Processing/Solar System

A Newbie's Question

Posted By Roland Christen
You're not quite a newbie wink , Maurizio, but I have a similar question myself, so let's see what the experts say.

Roland Christen

February 4, 2005 06:49 PM Forum: CCD Imaging and Processing/Deep Sky

M51 - Help needed

Posted By Roland Christen
Is this an ABG chip (anti-blooming?) If so, this may be the best you will get out of it.

Roland Christen

February 5, 2005 04:58 PM Forum: CCD Imaging and Processing/Solar System

Solving the "ringing" problem with processing

Posted By Roland Christen
Ringing can also give you false Enke divisions. I'm beginning to suspect that a lot of the Enke divs that show up in images may be the result of unsharp masking pulling in the black from the edge of the rings and creating a ringing shadow. I found a super image of Saturn taken from Pic du Midi with the 1 meter reflector which shows the real Enke as seen from earth. It also does not show it sliding from the edge towards the middle of the A ring as most amateur images seem to do.

Roland Christen

February 5, 2005 05:01 PM Forum: CCD Imaging and Processing/Solar System

Archimedes

Posted By Roland Christen
That looks very smooth and 3 dimensional.

Roland Christen

February 7, 2005 10:16 PM Forum: Equipment Talk

Viewing last night

Posted By Roland Christen
>>I have posted a picture of the Trapezium >>

Where did you find that picture?

Roland Christen

February 10, 2005 01:58 AM Forum: Equipment Talk

telescopes and Quality.

Posted By Roland Christen
Here is a handy dandy comparison of a 10" Newtonian mirror performance with wavefront errors varying from 1/2 wave to 1/20 wave.

Pick your poison.

Roland Christen

February 11, 2005 05:54 PM Forum: CCD Imaging and Processing/Solar System

My Atik is in the mail

Posted By Roland Christen
How do you do color with this camera??

Roland Christen

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