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Re: Mount modeling


 

Hi Jeffrey

I think i see where the confusion is, and have some additional thoughts for you

First as others have said, Sync does not build a model, it only rotates the model. Align is the feature to create an alignment point and refine the model. Sounds like your Gemini is working correctly.

The confusion may arise from terminology: Some (typically older) controllers, "sync" was the Align function (Celestron controllers iirc).?

However, all this is probably academic. If you are already plate solving, there is no need to build a model. Plate solve/center routines have pretty much eliminated the need for building a pointing model. Assuming that you have a solve/center capability in your imaging application, you do not need to build a pointing model.?

Brian


On Tue, Mar 14, 2023 at 1:13?AM JH via <super3dblender=[email protected]> wrote:
Another question came up about mount modeling which reminded me of my
last clear night (some months ago).

I use Ekos/Kstars to control the session and it has a mount modeling
tool (image of this tool is attached). It will slew the scope to a
bright star (or some chosen criteria) and plate solve. I haven't fully
dived into this tool so I've been doing this manually the last couple
times I went out. Here's my process: find a star above my horizon (and
buildings), slew, plate solve and "move to target," which adjusts until
the target star is in the center of the frame, then syncs the mount,
then move to another star and repeat.

Now, my question is the response to the result (or lack thereof) of this
process. For the first three or so stars on the east side of the
meridian (mostly where I shoot), the pointing accuracy increases and
puts the target star closer to the center with the initial slew, but any
stars beyond that will continually be noticeably off-center, requiring
another adjustment and plate solve before it's accepted. Well, maybe my
scope is flexing, who knows. I went into the Gemini web server and
looked at the mount models; they're completely blank. No cone error, no
polar align error, no stars, nothing.

Is mount modeling only done in the Gemini hand controller? I thought
syncing on several stars would make the model. This is G2 L5. Does the
Gemini computer not use the sync command as part of its modeling routine
like the tool's description suggests?

Thanks
Jeffrey







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