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How often are the large errors and on what axis
(R.A. or Dec). What are your brightness readings? If you are getting
consistent A2's and A3's and then sudden A8's or higher you may be hitting bad
portions of the worm, barring any bumps of the mount or wind gusts. When I
use the ST-4 I like to keep the EA around 1 sec and adjust the B and
BA. Only as a last resort do I adjust the EA any higher. My
advice is to run some tests using a brighter star and keep the integrations
short, see what it does, then run tests with longer exp, i.e. 5 sec. A
sudden bad spot during a 5 sec exposure can send the star out of the guiding
box. As for the film in the camera, only developement will tell. A
bad focus will also give you erratic readings on the ST-4. If you are
guiding at a focal length close to or longer than the scope you're shooting
through then you may not have very large trails, if any at all. Any shot
no matter how bad isn't a wasted shot, as long as you learn something from
it.
Daniel
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