Re: [APML] Northern Barnards Loop

["tan@home.com" <tan@home.com>]

Thanks everyone for the nice words.

Volker, I used the Kodak Wratten gel filters number 92,58,47 (RGB). The 
number 92 filter for red is slightly narrower band than the usual no. 25 
filter and allows for longer red exposure before sky fog limit sets in 
thereby producing better SNR in this channel.

  Bobby, I think it would take a ton of shots with a 4" refractor and a 
CCD imager to cover this field as can be seen by the field of M78 taken 
with a 5" f/6 refractor. Granted this FL is longer but you get the idea. 
    One can use a 50-100mm telephoto lens instead though. To get the 
same depth as the Schmidt camera combination with TP would produce quite 
a few bloomed stars in the CCD case.

Loke


Volker Wendel wrote:

> Wow, Loke, great Tech Pan shot, the ST10 short of course too!!! Which filter
> set did you use for Barnards Loop?
> 
> Volker
> www.spiegelteam.de
> 
> 
> ----- Original Message -----
> From: <tan@home.com>
> To: <astro-photo@seds.org>
> Sent: Saturday, December 15, 2001 2:02 PM
> Subject: [APML] Northern Barnards Loop
> 
> 
> 
>>Hi,
>>
>>  This is a tricolor Tech Pan Schmidt camera shot of the Northern section
>>of Barnard's Loop (Sh2-276) in Orion. The open cluster near the middle
>>of Barnard's Loop is NGC 2112.
>>
>>http://www.starryscapes.com/nebula/barnards_loop_n.html
>>
>>Also in this image are M78,  NGC2064, NGC2067, NGC2071, the bluish
>>patches of nebulosity to the right of the image. Just for reference, an
>>enlarged version of this section is at:
>>
>>http://www.starryscapes.com/nebula/ngc2067.html
>>
>>This 2nd image was acquired using an ST10E CCD imager with an
>>Astro-Physics 130EDF refractor. Exposure data are on the website.
>>
>>Loke
>>
>>
>>
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