> It isn't set on the first image, it sets on the second one, so a short ~20 sec image is made first, then another
> ~20 sec image is made, and the initial tracking corrections are then applied on the third science image at the
> normal exposure you decide.

Okay, that's what I understood from what Craig has said previously.

But I think most imagers want longer exposures than 20 seconds. How would this work if a user wants to do 10 minute exposures?
Without an initial correction there might be enough star trailing in a 10-minute image that plate solves would fail and no images
would ever get collected.

I'm interested because APCC has a built-in declination-arc modeling feature. That is, it plate solves along the same declination at
different hour angles and produces a best-fit tracking rate model for each declination it samples. APCC interpolates rates between
individual declination arcs to produce a really accurate tracking rate model throughout the sky and falls back to the regular
all-sky tracking rate model if the user goes out of the area of the sky where there were no declination arcs to rely on. I showed
this feature to a number of people at AIC last November.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-pro&data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&sdata=xFdEjMaunMGV7KF4SPxZnKwZU9D23KQMyS5R3RXJmNY%3D&reserved=0
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> -----Original Message-----
> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Steven Steven
> Sent: Thursday, May 28, 2020 10:17 PM
> To: main@ap-gto.groups.io
> Subject: Re: [ap-gto] Mach2 Unguided testing continues
>
> It isn't set on the first image, it sets on the second one, so a short ~20 sec image is made first, then another
> ~20 sec image is made, and the initial tracking corrections are then applied on the third science image at the
> normal exposure you decide. Each subsequent exposure is calculated according to the tracking information
> gained from the previous image, and each one adjusts the motor speed as required to keep within the limits
> that you configure. Once the initial tracking rate is set, subsequent corrections are fine adjustments made by
> the software. In order not to chase the seeing conditions, you can configure AT to make adjustments every nth
> image, as described in the User Guide (which is in abbreviated form at the moment, but more than adequate
> for our purposes).
>
>
> S
>
> ________________________________
>
> From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Ray Gralak <groups3@...>
> Sent: Thursday, 28 May 2020 11:04 PM
> To: main@ap-gto.groups.io <main@ap-gto.groups.io>
> Subject: Re: [ap-gto] Mach2 Unguided testing continues
>
> > Yes, it works at multiple new targets in one night in different parts of the sky. The methodology incorporates a
> > plate solve of each image and subsequent correction using data from the previous image. It does what it's
> > supposed to do, easily.
>
> So, in a first time setup how is the tracking rate set for the very first image?
>
> -Ray Gralak
> Author of APCC (Astro-Physics Command Center): https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-pro&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=xFdEjMaunMGV7KF4SPxZnKwZU9D23KQMyS5R3RXJmNY%3D&amp;reserved=0 <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-%2F&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=u15XsF1OXW8DUEyRxhaTPinhJwBL%2BcMhXWOgI2pNYKo%3D&amp;reserved=0
> physics.com/apcc-pro>
> Author of PEMPro V3:  https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ccdware.com%2F&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=X8qCOIa5FTpq5lCZvKnM0wYSKLB0aPCBrnJAfmyx16c%3D&amp;reserved=0
> Author of Astro-Physics V2 ASCOM Driver: https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=7sehUMiUOOLkeiqHLI51KAd7TKlmw9uir%2B%2FKXp%2FpS%2Bc%3D&amp;reserved=0
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=7sehUMiUOOLkeiqHLI51KAd7TKlmw9uir%2B%2FKXp%2FpS%2Bc%3D&amp;reserved=0>
>
>
> > -----Original Message-----
> > From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Steven Steven
> > Sent: Thursday, May 28, 2020 6:27 PM
> > To: main@ap-gto.groups.io
> > Subject: Re: [ap-gto] Mach2 Unguided testing continues
> >
> > Yes, it works at multiple new targets in one night in different parts of the sky. The methodology incorporates a
> > plate solve of each image and subsequent correction using data from the previous image. It does what it's
> > supposed to do, easily.
> > S
> >
> > ________________________________
> >
> > From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Ray Gralak <groups3@...>
> > Sent: Thursday, 28 May 2020 9:15 PM
> > To: main@ap-gto.groups.io <main@ap-gto.groups.io>
> > Subject: Re: [ap-gto] Mach2 Unguided testing continues
> >
> > > Thanks Don, it's easy to use and I've been getting aspect ratios of around 2% to 6% regularly. This is
> > > unprecedented with me. I set it up and go to sleep. Enjoy!
> >
> > Does that work if you are going to do multiple new targets in one night in different parts of the sky?
> >
> > I think that type of application may be useful for certain types of telescopes that are hard to model, like some
> of
> > the larger inexpensive truss tube scopes. If one is using a solid refractor the all-sky model that APCC Pro
> > creates will give excellent results throughout the sky. I've posted images up to 30 minutes unguided at
> > 1.74"/pixel with round stars.
> >
> > -Ray Gralak
> > Author of APCC (Astro-Physics Command Center): https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-pro&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932922764&amp;sdata=xFdEjMaunMGV7KF4SPxZnKwZU9D23KQMyS5R3RXJmNY%3D&amp;reserved=0
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-physics.com%2Fapcc-pro&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=0XdQIUuhMxEJCLHhxskdPfjkhc4RRCj%2BjhutK0hFztY%3D&amp;reserved=0>  <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astro-%2F&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=fOf0%2FXS2UbxmIBxrzXQhsR%2BgzQVIrErsPcAuM7Y4kpg%3D&amp;reserved=0
> > physics.com/apcc-pro>
> > Author of PEMPro V3:  https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ccdware.com%2F&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=CSQprmMipIEnVHBp9qm%2FAbEuiQnq8LEvdecisFXYmYs%3D&amp;reserved=0
> > Author of Astro-Physics V2 ASCOM Driver: https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=dnuaRUanVcv7RPQLBdB4viISOfGvCH0VaCRIEH0HLD8%3D&amp;reserved=0
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=dnuaRUanVcv7RPQLBdB4viISOfGvCH0VaCRIEH0HLD8%3D&amp;reserved=0>
> > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.siriusimaging.com%2Fapdriver&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=dnuaRUanVcv7RPQLBdB4viISOfGvCH0VaCRIEH0HLD8%3D&amp;reserved=0>
> >
> >
> > > -----Original Message-----
> > > From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Steven Steven
> > > Sent: Thursday, May 28, 2020 2:15 PM
> > > To: main@ap-gto.groups.io
> > > Subject: Re: [ap-gto] Mach2 Unguided testing continues
> > >
> > > Thanks Don, it's easy to use and I've been getting aspect ratios of around 2% to 6% regularly. This is
> > > unprecedented with me. I set it up and go to sleep. Enjoy!
> > >
> > > Steve
> > >
> > > PS: The plate solve is very useful and helpful in getting accuracy - to the pixel.
> > > ________________________________
> > >
> > > From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Donald Rudny
> > > <mkea13800@...>
> > > Sent: Thursday, 28 May 2020 5:02 PM
> > > To: main@ap-gto.groups.io <main@ap-gto.groups.io>
> > > Subject: Re: [ap-gto] Mach2 Unguided testing continues
> > >
> > > Thanks, Steven.
> > >
> > > Here's a link to the manual.
> > >
> > >
> > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fforum.starkeeper.it%2Fuploads%2Fshort-url%2Fikk1ph2GnqeBVLWNdbsui6rHZjH.pdf&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=RyXILEdPhlxBWVFSiQNDzH19qA%2Fr8jzrG4n4lki89ag%3D&amp;reserved=0
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fforum.starkeeper.it%2Fuploads%2Fshort-url%2Fikk1ph2GnqeBVLWNdbsui6rHZjH.pdf&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=RyXILEdPhlxBWVFSiQNDzH19qA%2Fr8jzrG4n4lki89ag%3D&amp;reserved=0>
> > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fforum.starkeeper.it%2Fuploads%2Fshort-url%2Fikk1ph2GnqeBVLWNdbsui6rHZjH.pdf&amp;data=02%7C01%7C%7Cc2c90a6ff62a4bb3240308d803d49a39%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637263558932932758&amp;sdata=RyXILEdPhlxBWVFSiQNDzH19qA%2Fr8jzrG4n4lki89ag%3D&amp;reserved=0>
> > >
> > >
> > > Don Rudny
> > >
> > >
> > >
> > >        On May 28, 2020, at 10:42 AM, Steven Steven <steven447@...> wrote:
> > >
> > >
> > >
> > >
> > >
> > >                ATrack (Adaptive Tracking) has been around for a year doing the same thing and recently I have
> > > switched to it for unguided imaging.  So if anyone wants to use ATrack while waiting for AP to add the
> > software
> > > to APCC then they should contact Craig Young at Crystal Lake Observatory.  The use of PinPoint is
> requierd,
> > > and that's easy.
> > >
> > >
> > >
> > > ________________________________
> > >
> > >        From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Terri Zittritsch
> > > <theresamarie11@...>
> > >        Sent: Thursday, 28 May 2020 9:26 AM
> > >        To: main@ap-gto.groups.io <main@ap-gto.groups.io>
> > >        Subject: Re: [ap-gto] Mach2 Unguided testing continues
> > >
> > >
> > >        Roland, this looks exciting, any ETA for release?
> > >
> > >        This seems like a great feature for us mobile (non fixed installation) users.      Given how easy and fast
> > > this is, 5 minutes/hour of object tracking, will this be usable if you also have a PC connected (for things like
> > > plate solving) and do you use it with, or instead of, APCC?
> > >
> > >
> > >
> > >        Terri
> > >
> > >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>