Re: [APML] Shooting globular clusters...

[Steve.Holak@bcitpa.com]

Don,
     I'm also shooting with a 12" LX200 (classic); here's a link to an M13.
Please note that this is a quick scan off an inexpensive home office
flatbed scanner from the developing photoshop's very dark **print** and not
from the negative (I'm having issues; I'm going to get some shots off to
Tony Hallas for scanning), and there's not much dynamic range, and it has a
purplish cast.

*But* you can see that the core is not overexposed (you can even see the
"X" pattern in the core).

It's a 20 minute F /10 on the old (pre-"improved") Supra 400, OAG manually,
slightly cropped here, shot about 90 minutes before the object crossed the
meridian.

  I have a five and a 10 minute exposure as well, and if the scan does not
allow me to bring out the full range of the object, I plan to mask in the
core in Photoshop.  But I would not shoot longer than 25-30 on Supra 400
without the risk of burning out the core, but you might want to bracket
fifteen minutes on either side of 30 minutes with E200 and see what kind of
results you get there; this object is so bright that I can clearly see it
in the viewfinder of my OM-1, which is pretty darn dark, and a slower finer
film might give you some good results here as well.

http://mywebpages.comcast.net/sholak/CRO/m13.jpg


Steve Holak
Senior Software Architect

Brokerage Concepts IS Dept.
610-491-4879

email:  steve.holak@bcitpa.com


                                                                                                                        
                    "Don Spencer"                                                                                       
                    <ecdon@cox.net>           To:     "Discussion of Film Astrophotography" <astro-photo@seds.org>      
                    Sent by:                  cc:                                                                       
                    astro-photo-bounce        Subject:     [APML] Shooting globular clusters...                         
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                    08/08/2003 01:46                                                                                    
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Hi all,
           I was hoping someone here would be able to give me a few
pointers
on shooting globular clusters. I took 2 30 minute exposures on M30 the same
night I shot M8, and I got to tell you, they were horrible. Core was really
burned out (I expected that) but the stars just outside the core kinda
blurred together. Combining the images didn't help much. So all you masters
of the globs, any suggestions? BTW, I'm sooting these with a 12" LX200.
Thanks,
Don Spencer


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