Re: [APML] OT - CCD Image of M81

["John Boudreau" <jeboud@attbi.com>]

Hi Brian,

Outstanding detail--- nice job!

As Matt mentioned, the color balance looks off quite a bit though. It has a magenta cast on my monitor.

Is the old 20" Newt permanently mounted up at Stellafane?

Your M81 image has some of the sharpest stars I've seen from an RC--- looks like you have a good one. Recently I've seen some shots from other RC's that exhibit fairly strong halos around the brighter field stars that look like a turned-down edge problem on the primary.

John Boudreau
http://home.attbi.com/~jeboud/astro.htm

----- Original Message ----- 
From: "Brian Lula" <brianl@polytecpi.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Thursday, April 03, 2003 12:10 AM
Subject: [APML] OT - CCD Image of M81


> Hi All,
> 
> After a 6 month hiatus (taking down the old f/5 20" Newt, moving it up to
> Stellafane, rebuilding and upgrading the mount and then installing the new OTA) this is the
> "first light" color CCD image of M81. This image was taken through a 20" RC with
> a Finger Lakes IMG6303E CCD camera. It is 72:24:24:24 minute respective LRGB
> exposure in average New England seeing conditions about 10 miles from the city
> of Worcester. A step backward in one sense..considerably longer exposures are needed
> at F/8 than at F/5 for good CCD SN. 
> 
> The new image is at:
> 
> http://www.heavensgloryobservatory.com/Color_Jpegs/m81FRGB05-6303Eweb.jpg
> 
> 
> Best regards, Brian Lula
> 
> 
> Brian Lula
> Polytec PI, Inc.
> (508) 832-3456
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
> 


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