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Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Alan Friedman

December 29, 2003 12:09 AM Forum: CCD Imaging and Processing/Solar System

Saturn 03-12-26

Posted By Alan Friedman
Mark -

That's a very good image and very impressive with Saturn so low in the sky.

Alan

December 29, 2003 05:50 PM Forum: CCD Imaging and Processing/Solar System

Posidonius with TMB 8" F/9

Posted By Alan Friedman
Jim -

Welcome back from lunar orbit - and thanks for bringing home that spectacular shot!

Alan

December 29, 2003 11:26 PM Forum: CCD Imaging and Processing/Solar System

Encke Division

Posted By Alan Friedman
Hi Wes -

You surely had a two ansae encke in your image from the 24th.
Not easy to say, or easy to do!

Alan

January 3, 2004 05:18 PM Forum: CCD Imaging and Processing/Solar System

DSLR Fuji S2: 10 sec. on M42 @800 ISO

Posted By Alan Friedman
Despite the oblong stars, your focus was good enough to capture E and F in the trapezium. Very nice.

Alan

January 5, 2004 11:03 PM Forum: CCD Imaging and Processing/Solar System

What is Gain?

Posted By Alan Friedman
Hi Jim -

I'm sure someone can give a better technical explanation, but from my understanding - gain is electronic amplification of the levels in the image without adding signal - so with gain comes pain - noise.

In perfect seeing, the best image would come with the lowest gain setting that produces a sufficiently bright image. In the real world it's more complicated. In average seeing, using a higher shutter setting will freeze details that can't be captured otherwise - but to move to a faster shutter will require gain to be increased. I find that I still fiddle with these settings every night I go out - almost as much as I fiddle with the focus! But the proper marriage should be a function of the object brightness, aperture and seeing.

Just my .02!

Alan

January 6, 2004 05:29 PM Forum: CCD Imaging and Processing/Solar System

Three scopes....three Saturns

Posted By Alan Friedman
Interesting comparison - were these taken on different nights?

thanks,
Alan

January 7, 2004 07:03 PM Forum: CCD Imaging and Processing/Solar System

My imaging effort from last night (cold!!!)

Posted By Alan Friedman
Very nice moon! What is VNC?

Alan

January 7, 2004 07:25 PM Forum: CCD Imaging and Processing/Solar System

My new ST8XE first light...

Posted By Alan Friedman
Chris -

Beautiful shot and processing!

Alan

January 9, 2004 05:59 PM Forum: CCD Imaging and Processing/Solar System

SATURN: Konus Motormax 130

Posted By Alan Friedman
ditto here - a very good image.
And seeing 9/10 - I would like a scoop of that!
Best of luck with your new scope.

Alan

January 11, 2004 05:47 PM Forum: CCD Imaging and Processing/Solar System

M42 in Pastel

Posted By Alan Friedman
Very interesting result Mark. It is always easier for me to see the faint nebulosity of a deep sky object in the negative image - but have never seen it applied to a bright wide field object like M42.

Thanks for posting it,
Alan

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