[AZ-Observing] Re: NGC 6888 - Crescent Nebula

  • From: "Ken Sikes" <kengsikes@xxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Tue, 5 Jul 2011 14:24:07 -0700

Howard a 3 3/4 hour film exposure, now that's an accomplishment, my longest 
manual guided exposure was 60 minutes

Ken Sikes
----- Original Message ----- 
From: "Howard Anderson" <handy13@xxxxxxxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Tuesday, July 05, 2011 10:42 AM
Subject: [AZ-Observing] Re: NGC 6888 - Crescent Nebula


Hi Mike,

Excellent!

I shot that object in 1997 using Hypered Agfachrome RSX 100 film
and only got this after 3.75 hours of exposure time at f/10:
http://www.astroshow.com/astropho/crescent.htm.

That was my best of  4 or 5 previous attempts over a year or two!

At the time I considered this object to be pretty difficult.  Still is I
guess.

Your shot is great!

Thanks,

Howard

Mike Wiles wrote:

>We had a fantastic time observing and imaging at Fredericksen Meadow this
>past weekend. In a full demonstration of the depths of our telescope
>junkie-ness, at one point we definitively counted 9 telescopes for 4
>observers.  Attached is the first set of really nice data I was able to
>capture over the week, a Hyperstar image of the Crescent Nebula.  I plate
>solved the stack of images as part of my post-processing and Maxim DL
>counted just shy of 40,000 stars in the 2.5º x 1.5º field of view.  Getting
>the nebulosity to really show through all the clutter of the stars was the
>most difficult task in processing the image, but I'm pleased with my end
>result.
>We also hunted the Crescent down visually with both a 15" Obsession and a
>TEC 140 refractor.  It's a much easier object to capture photographically
>than it is to see visually, that's for sure!!   Not too difficult in the
>15", but I'd have to mark it down as a "maybe" for me through the smaller
>refractor - a testament to my lack of visual observing skill more than any
>comment on the telescope.  In fact, after viewing Saturn through the TEC 
>140
>this past weekend I can now say I understand what all the fuss is about 
>when
>it comes to APO refractors.
>
>Enjoy!!
>
>Mike
>
>Object - NGC 6888 - Crescent Nebula
>Telescope - Celestron 11" Edge HD operating at f/2 via Hyperstar
>Guiding - QHY5, Vixen ED80SF and Maxim DL
>Exposure - 20 x 2 minutes (40 minutes total) with QHY8PRO camera and Maxim
>DL
>Calibration - Stacked & Calibrated in Maxim DL (flats & bias, bad pixel 
>map,
>no darks)
>Post-Processing - Photoshop CS5 - Levels & Curves, Minimum filter
>
><http://www.flickr.com/photos/ewwwtopia/5903066024/>
>NGC6888 <http://www.flickr.com/photos/ewwwtopia/5903066024/> by Mike
>Wiles<http://www.flickr.com/people/ewwwtopia/>,
>on Flickr
>
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