Re: [APML] E200 North America + 1/3 Pelican Nebula

[William Castleman <william@wlcastleman.com>]

  Thank you for sharing this with us.  I enjoyed your report of another annoying source of light pollution that most of us usually don't have to 
deal with.  How long was your exposure?  Bloated stars may be in part be due to E200 effect in addition to slightly off focus.

William Castleman
http://www.wlcastleman.com

On Wed, 24 Nov 2004 15:53 , Raymond TSE <raymondtltse@yahoo.co.uk> sent:

>Dear all, 
>
>Single image of 30 min North America (main target) + 1/3 Pelican Nebula, taken by Leica M280mm lens at F5.6, on EM200 mount with 
webcam autoguide by 50mm finder (183mm focal length), at East Dam, Sai Kung, Hong Kong on 13-07-2004. 
>
>Focus is a bit soft due to very dim viewfinder in Ricoh camera body (20 years old). 
>
>Transparency : about 7/10 
>Stability : about 7/10 
>Wind : mild 
>Light pollution : some squid boats there with strong flood lights. 
>(one of the very good clear summer nights, if not light pollutted by squid boats). 
>
>http://www.hkastroforum.net/bbs/files/ngc7000-2c.jpg
>(504 x 672 pixels at 276K file)
>
>Raymond Tse



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