Re: [APML] ST-4 questions

[Chuck Vaughn <aa6g@aa6g.org>]

Jason,

> I have never had problems running with FL = short even though I am guiding
> with an OAG at 3000mm.  I understand that the  "Long" setting provides a
> larger track box which makes it less likely that the guide star will fall
> off and get lost during tracking.  I also understand that it increases the
> download time between exposures which can theoretically decrease your
> tracking accuracy.  I run with the Short setting since I have no problems.

I do the same and there's another reason to not bother with Long unless
the ST-4 cannot see a star. The Short mode uses a 9x9 track box. If you
use a pixel size of 15um, at 3000mm that comes out to a 9.3x9.3 arcsecond
box. IMO if you go outside a box that big the photo is ruined.

Chuck <aa6g@aa6g.org>


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