[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [APML] A question for you ST-4 experts

Mike, Stuart and Chuck,

Thanks for your insights, and Mike, thanks for the link. I had not seen
it. 

An update: When the sky started getting bright because of the moon. I
ended the exposure and re-set the ST-4 with the larger (40) calibration
parameters, ran a calibration and commenced guiding. I saw the exact
same corrections I had been seeing; 0's, 1's, and an occaisonal 2 or 3.
BTW, the star easily stayed on the chip by using the numbers I
mentioned earlier. 

My conclusion is that for the focal length I'm using, the '20' I had
been using as the calibration input is more than sufficient and is
optimized for my setup.

However, I'd hazard a guess that for those shooting at longer focal
lengths, a bigger calibration movement will be a good thing. As long as
the star stays on the chip. 8-)

Alan





SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102
& http://www.pbase.com/avoetsch12952/takpf


		
____________________________________________________
Start your day with Yahoo! - make it your home page 
http://www.yahoo.com/r/hs 
 
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo