RE: [APML] ST-4 question

["Chris Schur" <cschur@therim.com>]

Could be slop in the declination upon reversal has just gotten worse.  

Chris

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Mike Connors
Sent: Sunday, September 05, 2004 9:59 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] ST-4 question


Alan,

I get these symptoms when there is frost on the chip.


Mike Connors


----- Original Message ----- 
From: "Alan Voetsch" <alanv12952@yahoo.com>
To: "APML" <astro-photo@seds.org>
Sent: Sunday, September 05, 2004 9:31 PM
Subject: [APML] ST-4 question


> Hey all,
> 
> Last night when I calibrated the ST-4, it did not return the star to
> where it started. Started at 52 50, ended at 58 50. It passed
> calibration and I started an exposure. 50 minutes in it lost the
> guidestar.
> 
> Tonight, the same thing happened during calibration. Started at 52 48,
> and ended at 58 48. I moved it back to 52 and started the exposure. I
> will keep closer watch on it tonight.
> 
> Also the brightness readings are sorta wacked. Going brom a boost of 2
> to a 3, increased the reading from 13 to almost 50. That is much more
> than normal for my guider. Usually it would move up to 20 or so.
> Tonight again, the brightness reading is lower than I would have
> guessed for this star.
> 
> It has never not returned the guidestar to it's starting position
> before. Anyone have any idea why it might start doing this?
> 
> Thanks,
> Alan
> 
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