Re: keypad pointing models. Was: Re: Paramount ME vs. AP 1200GTO
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Jeff Young <jey@...>
Ray --
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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? Cheers, -- 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 point. 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 painless. Comments? -Ray -----Original Message-----> From: ap-gto@... <mailto:ap-gto%40yahoogroups.com> [mailto:ap-gto@... <mailto:ap-gto%40yahoogroups.com> ] > On Behalf Of Paul Mortfield > Sent: Wednesday, February 28, 2007 10:14 AM > To: ap-gto@... <mailto:ap-gto%40yahoogroups.com> > 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 imaging > 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 the > meridian. If its still off, RCal on a bright star in that target's > constellation and off you go again. > > The biggest problem with doing a handpaddle model is how are you > going to enter a pointing model into the handpaddle, ie, every star > would have to accurately be centered in a cross hair eyepiece (don't > rotate the diagonal) then recorded. To do a good all sky model, > you'll need a bare minimum of 30-50points. I just can't see sitting > 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 from > day1, then its impossible to model the sky due to mirror flops, > 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 finder > scope or telrad makes everything so simple just in case. > For imaging in the field, I'm not gonna waste precious dark time > running a model, since usually I'm only grabbing 1-3 targets a night. > That way using the laptop/planetarium program its even easier to RCal > near the target. I also make use of Maxim's centering capabilities > 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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