Re: keypad pointing models. Was: Re: Paramount ME vs. AP 1200GTO

Jeff Young <jey@...>

Ray --

One of the things I always hated about Meade's AutoStar was that it was
so complicated that you never quite knew what it was doing. From what
I've read online, the same thing could be said for the CGE software.

So while I like the idea of a self-learning pointing model, I'd also
want an easy indication to tell whether it was on or off, and an easy
way to zero out the model.

On a side note, do you know if moving-primary mirror flop is predictable
enough for the model to handle?

-- Jeff.


From: ap-gto@... [mailto:ap-gto@...] On
Behalf Of Ray Gralak
Sent: Wednesday, February 28, 2007 10:36 PM
To: ap-gto@...
Subject: RE: [ap-gto] keypad pointing models. Was: Re: Paramount
ME vs. AP 1200GTO

Hi Paul,

First you would enable a mode in the hand box that will enable
the collection of
points and build a model from them. You then slew to your first
target. If it is
not centered you center the object in the eyepiece and click
Synch (or RCAL). A
correction point is then added to the pointing model. As you go
through more
visual objects the pointing model becomes more accurate each
time you add a

If you are not interested in having a pointing model or are
using an external
model then you wouldn't use this feature. I think that building
a model that
improves pointing accuracy as you observe would be pretty



-----Original Message-----
> From: ap-gto@... <>
[mailto:ap-gto@... <> ]
> On Behalf Of Paul Mortfield
> Sent: Wednesday, February 28, 2007 10:14 AM
> To: ap-gto@... <>
> Subject: Re: [ap-gto] keypad pointing models. Was: Re:
> Paramount ME vs. AP 1200GTO
> Hey gang,
> maybe I'm just missing something here from the visual users.
> I occasionally use my mount for visual usually after an
> session and remove the camera and ya its a hassle to drag out
a PC in
> the cold so I too prefer the keypad. The objects were always
in the
> field if I stayed on the same side of the meridian. And even
so, if I
> did a meridian flip, I'd goto any bright star on that side, do
a RCal
> and I'm good to go for the majority of objects on that side of
> meridian. If its still off, RCal on a bright star in that
> constellation and off you go again.
> The biggest problem with doing a handpaddle model is how are
> going to enter a pointing model into the handpaddle, ie, every
> would have to accurately be centered in a cross hair eyepiece
> rotate the diagonal) then recorded. To do a good all sky
> you'll need a bare minimum of 30-50points. I just can't see
> there and entering all this data, visually by hand. For
imaging and
> a fixed imaging train, there's wonderful tools to
automatically do
> that and do 100 points while you grab a bite of food.
> Also, if you're using an SCT and don't keep the mirror locked
> day1, then its impossible to model the sky due to mirror
> rotating the diagonal and making sure you're always centered
on axis.
> In the field, the polar scope has always gotten me so close
that I
> don't bother drifting and again, usually a Sync in the
beginning and
> RCal if needed later on is all thats necessary. A little 50mm
> scope or telrad makes everything so simple just in case.
> For imaging in the field, I'm not gonna waste precious dark
> running a model, since usually I'm only grabbing 1-3 targets a
> That way using the laptop/planetarium program its even easier
to RCal
> near the target. I also make use of Maxim's centering
> talking to the mount and once again the target is where I want
it in
> a matter of seconds.
> So please enlighten me to the visual side that I don't
regularly do.
> thanks,
> ...paul.
> p.s. Dave T. hopefully next year's Starfest will be
non-raining, so I
> can look thru your scope.

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