Re: [MaxImDL] Maxpoint and Syncing (was Re: Remotely Unparking LX200GPS + First Sync)


Sep 16, 2003

 


----------------------------

#8313 Sep 16, 2003

Can someone tell me how MaxPoint handles a sync command issued in The_Sky

or MaxIm. The help file doesn't talk about sync. I quite often issue

sync following a large telescope movement and centering of an object. Does

this cause a problem when using MaxPoint? Should I use or avoid sync?



Greg



----------------------------

#8318 Sep 16, 2003

Greg Salyer wrote: > Can someone tell me how MaxPoint handles a sync command issued in The_Sky

> or MaxIm. The help file doesn't talk about sync. I quite often issue

> sync following a large telescope movement and centering of an object. Does

> this cause a problem when using MaxPoint? Should I use or avoid sync?



Sync will not ruin your model, but it will shift it to line up with your

new position. As a result, pointing will now be more accurate in the

vicinity of that point, bit it may be a little less accurate elsewhere.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



100 Craig Henry Drive, Unit 106,

Ottawa, Ontario, Canada, K2G 5W3



Phone: (613) 225-2732

Fax: (613) 225-9688



---------------



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#8320 Sep 16, 2003

Doug, I'm still a bit confused. After a sync, I would expect MaxPoint to

know that the telescope coordinate is 'dead-on' - no adjustment needed for

that point, but, as I recall (from a clear sky a month ago) this doesn't

happen. I also seem to recall an old discussion on this forum about

MaxPoint not knowing about sync. This would explain why I still saw

MaxPoint making corrections, but then I'm not sure what sync is doing other

than making The_Sky or MaxIm think the telescope is close to the object I

sync'ed on. Neither of these sound 'right'. Obviously I'm missing something.



Greg



At 10:19 AM 9/16/2003 -0400, you wrote: >Greg Salyer wrote:

> > Can someone tell me how MaxPoint handles a sync command issued in The_Sky

> > or MaxIm. The help file doesn't talk about sync. I quite often issue

> > sync following a large telescope movement and centering of an object.

> Does

> > this cause a problem when using MaxPoint? Should I use or avoid sync?

>

>Sync will not ruin your model, but it will shift it to line up with your

>new position. As a result, pointing will now be more accurate in the

>vicinity of that point, bit it may be a little less accurate elsewhere.

>

>Doug



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#18912 Jun 21, 2005

I was always wondering about this when I tried the Maxpoint demo

some months ago - how does this interact with the Maxpoint scope

model?



As far as I understand it, the sync simply sets the current scope

RA/Dec to that of the solved image, to correct the current pointing.

Hoever, that's also what maxpoint does.



If you change the values recording the current scope pointing

outside the Maxpoint model, what does that do to the future use of

the model?



I should say that I was certainly impressed with Maxpoint - it

really did make my relatively cheap mount perform far better and

it's solidly on my wish list.



John



--- In MaxImDL@yahoogroups.com, "Douglas B. George" dg@d...> wrote:

> Larry,

>

> Here's a tip: if you're in the right ballpark, but the star isn't

on

> the chip, use PinPoint in spiral search mode. It will quickly

find the

> right field center. Then you just do Sync from MaxIm, and it will

set

> the telescope to the coordinates calculated by PinPoint. It's

fast and

> incredibly accurate.

>

> Doug

>

---------------

>

> Doug George

> dgeorge@c...

>

> Diffraction Limited

> Makers of Cyanogen Imaging Products

> www.cyanogen.com

>

> 25 Conover Street

> Ottawa, Ontario,

> Canada, K2G 4C3

>

> Phone: (613) 225-2732

> Fax: (613) 225-9688

>

---------------

>

>

> Larry Summers wrote:

> > Hi Tim,

> >

> > This most likely will not help you with your problem,,,,but when

I

> > first start my scope, I will slew to the closet bright star,

(using

> > The Sky) in order to sync on it before I do anything else. If by

> > chance,the star in not in the field of view with the main camera

> > (SX716), I will then take an exposure using the guide camera

(ST5c)

> > and with the much bigger field of view, the star Iwant to sync

on

> > will be the brightest star. Knowing where the star should be,

before

> > hand when a star is sync, I will use MaxIm DL to control and

move

> > the scope to that spot in the field of view of the guide camera

and

> > then take another exposure with the main camera and every time

the

> > star is then always in the field of view. A little tweaking to

> > center, then sync and I'm ready to go. If you can control the

scope

> > remotely, you should be able to do this also?

> > Hope this helps.

> >

> > Larry







----------------------------

#18915 Jun 21, 2005

John Winfield wrote: > I was always wondering about this when I tried the Maxpoint demo

> some months ago - how does this interact with the Maxpoint scope

> model?

>

> As far as I understand it, the sync simply sets the current scope

> RA/Dec to that of the solved image, to correct the current pointing.

> Hoever, that's also what maxpoint does.

>

> If you change the values recording the current scope pointing

> outside the Maxpoint model, what does that do to the future use of

> the model?

>

> I should say that I was certainly impressed with Maxpoint - it

> really did make my relatively cheap mount perform far better and

> it's solidly on my wish list.



If you do a sync, it will realign the MaxPoint model so that it matches

perfectly at that one point. You can do this if you lose mount

pointing; it will have no adverse effect.



However, after a sync it is preferable to then do a "Recal Permanent"

and collect a few measurement points spread around the sky, just to make

sure it's a reasonably accurate average of the RA/Dec offset over the

whole sky.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



25 Conover Street

Ottawa, Ontario,

Canada, K2G 4C3



Phone: (613) 225-2732

Fax: (613) 225-9688



---------------



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