Date   

Re: Balance: what happens at Meridian flip?

Roland Christen
 

The 900/1200 mounts have spring action built into the motor mounting bracket. They require meshing the teeth properly in order to take advantage of the spring action. The very early and oldest mounts had fixed brackets with no spring, and they would require careful mesh. So, it depends what vintage mount you have.

Rolando

-----Original Message-----
From: Don Anderson via groups.io <jockey_ca@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Mon, Aug 9, 2021 2:01 pm
Subject: Re: [ap-gto] Balance: what happens at Meridian flip?

This true for the older 2008 900GOTO? 

Don Anderson


On Monday, August 9, 2021, 09:48:48 a.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


With our spring loaded mounts balance both axes, especially Dec.

Roland



-----Original Message-----
From: Nick Iversen <inoddy@...>
To: main@ap-gto.groups.io
Sent: Sun, Aug 8, 2021 7:21 pm
Subject: Re: [ap-gto] Balance: what happens at Meridian flip?

What about dec balance? The manual says to balance camera heavy. I used to achieve counterweight heavy and camera heavy by balancing with the lens cap on. But after a while I figured that the lens cap was too heavy to do this and manual finessing was better.

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: Balance: what happens at Meridian flip?

Don Anderson
 

This true for the older 2008 900GOTO? 

Don Anderson


On Monday, August 9, 2021, 09:48:48 a.m. MDT, Roland Christen via groups.io <chris1011@...> wrote:


With our spring loaded mounts balance both axes, especially Dec.

Roland



-----Original Message-----
From: Nick Iversen <inoddy@...>
To: main@ap-gto.groups.io
Sent: Sun, Aug 8, 2021 7:21 pm
Subject: Re: [ap-gto] Balance: what happens at Meridian flip?

What about dec balance? The manual says to balance camera heavy. I used to achieve counterweight heavy and camera heavy by balancing with the lens cap on. But after a while I figured that the lens cap was too heavy to do this and manual finessing was better.

--
Roland Christen
Astro-Physics


Re: Mach2 runaway behavior

Luca Marinelli
 

Last night I decided to try and completely delete the Astro-Physics folder in Program Files and start from scratch, instead of only deleting the Setup file in the APCC directory. This appears to have solved the problem. I launched the imaging sequence in SGP and the scope slewed to the target, wiithout going off into a pier collision and without needing to manually home the Mach2. I don't know which file was responsible for the runaway behavior but a clean start of APCC fixed the problem.


Re: Balance: what happens at Meridian flip?

Roland Christen
 

With our spring loaded mounts balance both axes, especially Dec.

Roland



-----Original Message-----
From: Nick Iversen <inoddy@...>
To: main@ap-gto.groups.io
Sent: Sun, Aug 8, 2021 7:21 pm
Subject: Re: [ap-gto] Balance: what happens at Meridian flip?

What about dec balance? The manual says to balance camera heavy. I used to achieve counterweight heavy and camera heavy by balancing with the lens cap on. But after a while I figured that the lens cap was too heavy to do this and manual finessing was better.

--
Roland Christen
Astro-Physics


Re: APCC Setup help request for new AP1100

Ray Gralak
 

Hi Dave,

 

> In years past, I have worked with Mathematica, Matlab, written code, and designed and implemented electro-

> optical-mechanical experiments for 30 years. 

 

This probably has to do with your LAN configuration, not the software.

 

> Didn't know how to proceed, so I guessed and

> pressed 'connect to mount' button.  The response was unsatisfactory.  I saw a window claiming "Invalid firmware

> version ("V" or later required-No response from mount".  Also, flashing pink UDP button...

 

You have an error connecting to the mount, probably because you are using the wrong IP address. It could also be the cable is bad, or a few other things.

 

How did you determine the mount's IP address?

 

Are the CP4 and your PC connected on a LAN with a router? Or is this a direct connection between the computer and the CP4? There are several different ways this can go, depending on the LAN configuration.

 

> Having read and forgotten this entire help manual two months ago, I moved on and found on page 68, describing

> ethernet connections and the directive to click the " Find GTOCP4/GTOCP5 (magnifying glass) button.  That

> button seems 'grayed out'; in any case it is non-responsive.  

 

The button is greyed out when:

 

1) TCP or UDP are not selected as the connection type.

2) The mount is connected.

3) The Connect button has been pressed, and APCC is trying to connect to the mount.

 

It sounds like #3 may apply.

 

> When I follow the startup process in the printed CP-4 manual supplied with this new mount

 

Hint: did you also read through the relevant section(s) in the APCC help? In almost every group box in APCC, there is a tiny round button with a question mark, usually located in the upper right corner of that group box. If you click that button the help file will open to the relevant section. See this screenshot, which identifies that button for the Connection group box:

 

 

-Ray

 

 

 

 

> -----Original Message-----

> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of dcraft34@...

> Sent: Monday, August 9, 2021 3:40 AM

> To: main@ap-gto.groups.io

> Subject: [ap-gto] APCC Setup help request for new AP1100

>

> Hi,

> In days past, I thought of myself as a smart guy.  I am aging, and finding opportunities to question the continuing

> truth of that assessment.  I'm sure you ship new 1100GTO each month, yet this forum is not littered with

> messages from folks who cannot make their mount turn on.  So clearly, I am remiss somehow.

>

> I love this mount.  It looks and feels solid and dependable.  Non-tracking star trails of five minutes are beautifully

> straight at at 2850mm FL.  I have mounted a 14 inch F8 ACF, camera, filter wheels, moonlight focuser and 106#

> of counterweight.  Rough balance is complete.

> The CP-4 is connected to the control room computer via 100 ft of ethernet.  This cable has been rung out- using

> 200 ohms between pins 1 and 8 -the proper cable is connected.  The observatory power bus reads 12.95 VDC.

> The CP-4 shows a red pilot light and an amber light at the ethernet port.  I have ASCOM  6.5 service pack 1;

> driver AP ver 2 5.30.10;   APCC Pro setup 1.8.8.17 pdf.  Alternative ethernet cables are available.

>

> I have selected UDP LAN.

> When I follow the startup process in the printed CP-4 manual supplied with this new mount, on pages 28 and 29, I

> believe I have properly completed through step 6c.  Note: at this point, on the 'setup' screen, there is NO firmware

> version shown in the 'firmware' window box.  The following page (30) does not describe what I should do next.

> Page 30 describes workflow when using third-party software.  Didn't know how to proceed, so I guessed and

> pressed 'connect to mount' button.  The response was unsatisfactory.  I saw a window claiming "Invalid firmware

> version ("V" or later required-No response from mount".  Also, flashing pink UDP button...

>

> Having read and forgotten this entire help manual two months ago, I moved on and found on page 68, describing

> ethernet connections and the directive to click the " Find GTOCP4/GTOCP5 (magnifying glass) button.  That

> button seems 'grayed out'; in any case it is non-responsive.  Following the guidance on page 70 I created a host

> name GTOCP4_1338  and also tried GTO_CP4_1338 host name.  Clicking Connect to APV2 driver returned a

> few windows I clicked through (sure you wish to reconfigure the ascom driver-OK) (please restart the driver -OK)

> (the driver has been updated successfully) .

>

> Click 'connect to mount' yields flashing pink buttons NO RESPONSE FROM MOUNT and the same 'Invalid

> firmware'... window described above.

>

> Inappropriate speech followed.  Rereading the printed manual provided no further guidance.  I viewed the

> youTube videos but they seem to contradict the  1.8.8.17 pdf, or perhaps I don't understand.  I declare

> cluelessness.

>

> Can I hire someone for some reasonable rate (say $100 to $200) to hold my hand and walk me through this setup

> process step-by-step by telephone, until my new mount is actually tracking stars, and functional for PA

> adjustment? And hopefully teach me enough that if/when it hiccups in the future I might find my own unassisted

> path to a fix...

>

> In years past, I have worked with Mathematica, Matlab, written code, and designed and implemented electro-

> optical-mechanical experiments for 30 years.  I won't be a totally clueless basket case, but I might not be much

> help.

>

> Thanks.  Dave.


APCC Setup help request for new AP1100

dcraft34@comcast.net
 

Hi,
In days past, I thought of myself as a smart guy.  I am aging, and finding opportunities to question the continuing  truth of that assessment.  I'm sure you ship new 1100GTO each month, yet this forum is not littered with messages from folks who cannot make their mount turn on.  So clearly, I am remiss somehow.

I love this mount.  It looks and feels solid and dependable.  Non-tracking star trails of five minutes are beautifully straight at at 2850mm FL.  I have mounted a 14 inch F8 ACF, camera, filter wheels, moonlight focuser and 106# of counterweight.  Rough balance is complete.
The CP-4 is connected to the control room computer via 100 ft of ethernet.  This cable has been rung out- using 200 ohms between pins 1 and 8 -the proper cable is connected.  The observatory power bus reads 12.95 VDC.  The CP-4 shows a red pilot light and an amber light at the ethernet port.  I have ASCOM  6.5 service pack 1;   driver AP ver 2 5.30.10;   APCC Pro setup 1.8.8.17 pdf.  Alternative ethernet cables are available.

I have selected UDP LAN.
When I follow the startup process in the printed CP-4 manual supplied with this new mount, on pages 28 and 29, I believe I have properly completed through step 6c.  Note: at this point, on the 'setup' screen, there is NO firmware version shown in the 'firmware' window box.  The following page (30) does not describe what I should do next.  Page 30 describes workflow when using third-party software.  Didn't know how to proceed, so I guessed and pressed 'connect to mount' button.  The response was unsatisfactory.  I saw a window claiming "Invalid firmware version ("V" or later required-No response from mount".  Also, flashing pink UDP button...

Having read and forgotten this entire help manual two months ago, I moved on and found on page 68, describing ethernet connections and the directive to click the " Find GTOCP4/GTOCP5 (magnifying glass) button.  That button seems 'grayed out'; in any case it is non-responsive.  Following the guidance on page 70 I created a host name GTOCP4_1338  and also tried GTO_CP4_1338 host name.  Clicking Connect to APV2 driver returned a few windows I clicked through (sure you wish to reconfigure the ascom driver-OK) (please restart the driver -OK) (the driver has been updated successfully) .

Click 'connect to mount' yields flashing pink buttons NO RESPONSE FROM MOUNT and the same 'Invalid firmware'... window described above.

Inappropriate speech followed.  Rereading the printed manual provided no further guidance.  I viewed the youTube videos but they seem to contradict the  1.8.8.17 pdf, or perhaps I don't understand.  I declare cluelessness.

Can I hire someone for some reasonable rate (say $100 to $200) to hold my hand and walk me through this setup process step-by-step by telephone, until my new mount is actually tracking stars, and functional for PA adjustment? And hopefully teach me enough that if/when it hiccups in the future I might find my own unassisted path to a fix...

In years past, I have worked with Mathematica, Matlab, written code, and designed and implemented electro-optical-mechanical experiments for 30 years.  I won't be a totally clueless basket case, but I might not be much help.

Thanks.  Dave.


Re: Balance: what happens at Meridian flip?

Nick Iversen
 

What about dec balance? The manual says to balance camera heavy. I used to achieve counterweight heavy and camera heavy by balancing with the lens cap on. But after a while I figured that the lens cap was too heavy to do this and manual finessing was better.


Re: NINA and APCC, 32 or 64 bit

ap@CaptivePhotons.com
 

Use 64 bit unless you have a driver that is only 32 bits.

APCC vs ASCOM V2, TSX 32 bit, Pegasus power drivers, ASI cameras, EFW, optec focusers, Celestron Focusers all work fine for me, and absolve you of memory limitations if you have large format cameras (etc.).

-----Original Message-----
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of michael mccann via groups.io
Sent: Sunday, August 8, 2021 4:12 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] NINA and APCC, 32 or 64 bit

Fast question: I was going to load N.I.NA ver 1.11 but which version 32 or 64 bit?

Cheers
Mike


Re: AP 400 cables needed

 

Larry,

 

Please call our office on Monday. We can provide the cables that you need.

 

Clear Skies,

Marj Christen

Astro-Physics

11250 Forest Hills Road

Machesney Park, IL 61115

Phone: 815-282-1513

www.astro-physics.com

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Lawrence Lopez
Sent: Sunday, August 8, 2021 3:30 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] AP 400 cables needed

 

AP400 GTO:

The GTO Keypad: (GTO-1) has a 15' cable which connects to the GTO control panel.
While the cable is working it is shedding bits of black plastic snow from the sheathing.
Is this field replaceable ?
It does not have a connector on the Keypad.
It has a connector to the GTO Controller (GTOCP2) but it is missing the strain relief.

The Y cable is similarly missing the strain relief for the RA and DEC motors.

It was able to do slews to objects just fine using the Keyboard.
The Sky slewed to objects using a USB to Serial converter.

No optics was mounted at this time.

The biggest problem was finding all the parts to it.
Things got separated over the year.


AP 400 cables needed

Lawrence Lopez
 

AP400 GTO:

The GTO Keypad: (GTO-1) has a 15' cable which connects to the GTO control panel.
While the cable is working it is shedding bits of black plastic snow from the sheathing.
Is this field replaceable ?
It does not have a connector on the Keypad.
It has a connector to the GTO Controller (GTOCP2) but it is missing the strain relief.

The Y cable is similarly missing the strain relief for the RA and DEC motors.

It was able to do slews to objects just fine using the Keyboard.
The Sky slewed to objects using a USB to Serial converter.

No optics was mounted at this time.

The biggest problem was finding all the parts to it.
Things got separated over the year.


NINA and APCC, 32 or 64 bit

michael mccann
 

Fast question: I was going to load N.I.NA ver 1.11 but which version 32 or 64 bit?

Cheers
Mike


Re: Preventing Pier Crashes

Eric Dreher
 

Even not running APCC, pier crashes are not impossible.

The following happened about two weeks ago.  I was at the scope, setting up RD to observe activities from inside my home, with a NUC atop my rig.  I'm completely portable, so I need to PA every time I'm photographing.

Using SharpCap, I was slewing my scope to the 90 deg move needed when it just kept on going.  The driver emergency stop was completely non-functional and useless as I watched my Mach1 pier crash for the first time.  I jumped up and disconnected the power cable from my CP4 and started from scratch.

The first thing I checked was my cables.  As soon as I touched the CAT5 at the CP4, it literally fell out of the RJ45 connector.  Apparently I hadn't double-checked the physical connection when plugging in the cable earlier, and it had lost connection at the perfect time to start the slew but not allow it to stop when I released the driver "handset"button.

Things happen.  Never say never.  Cable duplicates are a must to have on-hand.  The CAT 5 wasn't defective, but it couldn't gone bad just the same, and with the same results.

Yes, I do have spare motor cables, as well as everything else.


Re: Preventing Pier Crashes

M Hambrick
 

Hi Ray

FYI I was not running APCC when this happened.

Luckily there was no actual pier crash because I was there watching the scope and mount and pressed the stop button on the keypad. Unfortunately I do not recall the exact circumstances or objects, but I am pretty sure that the counterweights were down.

Mike


Re: APPM Basic questions

ap@CaptivePhotons.com
 

Joe Zeglinski said:

 

  •     I keep wondering why you haven’t yet printed the actual HELP file. It is very well written and a pleasant read.  You can do that with most help files, as I have done. Prints as a PDF document.

 

  •     I prefer reading printed documents rather than boob-tube screens, unless I am in a hurry and need to enter a search word for faster “specific”  references - much like referencing the Index volume of a set of Encyclopaedias  :-)

 

We are somewhat the opposite.  By far I prefer to read on line, especially since something will trigger a thought, and I can do a text search in seconds rather than paging through … well, pages.

 

In this case my issue was I did not realize the help file was useful.  Most software I get the help file is somewhere from empty to a copy of the manual – if there even is a manual.  All too often it is a “just run it, it will be obvious” attitude.

 

I do have a printer.  Have to print UPS labels on something.  😊

 

  •    But then,  I’m “old school”.  Check into it.

 

I’m old.  And I went to school.  😊

 

Sometimes I even went to class. Though I confess to taking Astronomy 101 as a General Educational Elective (as opposed to say, Art History, in which I might have committed suicide).

 

I really do like reading manuals.  My earliest professional computer work was with DEC VMS, and it had a huge Orange Wall of binders of manuals (yes, paper, but who imagined Kindles then).  Now you get most products with a “quick start guide”, often in bad translations and obsolete by when you get it.

 

Glad to see AP actually HAS manuals.  Well, and Help Files.  Mea Culpa.

 

A big problem I have with manuals is they often are bad at “why”.  They frequently tell you “what”, sometimes “how”, but rarely explain the rationale behind it.  Got to give AP credit – their manuals (and help) come much closer to injecting  “Why” in there (you could always add a bit more, of course).

 

Linwood

 


Re: APPM Basic questions

Joe Zeglinski
 

Hi Linwood,
 
    I keep wondering why you haven’t yet printed the actual HELP file. It is very well written and a pleasant read.  You can do that with most help files, as I have done. Prints as a PDF document.
 
    I prefer reading printed documents rather than boob-tube screens, unless I am in a hurry and need to enter a search word for faster “specific”  references - much like referencing the Index volume of a set of Encyclopaedias  :-)
 
   But then,  I’m “old school”.  Check into it.
 
Joe
 

From: ap@...
Sent: Sunday, August 8, 2021 1:54 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APPM Basic questions
 

Linwood wrote:

 

  • One last question (ok, probably never such a thing)… is there a document that explains more about the meaning of the various model properties.  Or maybe what I am asking is whether any of those values are actionable for a user – if my Tube Flexure quadrupled (for example) with the same gear, does that tell me to DO anything?   Or are these more essentially constants in a very complex curve fit designed to minimize pointing errors, and despite real world derivation may not individually mean anything?

 

So I started reading the APCC help file and found definitions of these values.  I really need a 30 minute delay on emails.  😊

 

READ THE HELP FILES NOT JUST THE MANUALS.  I’ll have that printed large somewhere near my monitor. 

 

Sigh… sorry for the interruptions.

 


Re: PSA- Check your gear mesh! (Older mounts)

Christopher Erickson
 

I design, work on and maintain professional observatories for a living.

Having a periodic maintenance checklist and a thoughtful critical spares inventory is something ALL of the pro's and more experienced amateurs do.

Cables get damaged. Connectors get corroded. Hidden cable defects finally reveal themselves. Motors go bad. Encoders malfunction. Servo controllers malfunction. Software bugs reveal themselves. Having a few spare strategic cables (a very cheap investment) can significantly speed up troubleshooting and end up saving hours, days, weeks or even MONTHS of delays and associated expenses from happening.

One particular professional observatory I first worked on about 10 years ago was off-sky for 2 years. The professional staff of the observatory had struggled with getting things operational with no success. When they finally brought me in, I tracked down five different intermittent cable problems and got them back on sky in three days.

Having a critical spares inventory is a no-brainer.

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Sat, Aug 7, 2021 at 1:37 PM Steven Panish <scpanish@...> wrote:
It's kind of expensive to just keep as a spare, but with price no object, I agree in principle!  But my mount sits in the observatory and never goes anywhere and the cable never gets exposed to light, never (in my experience) snags.  
Steve

On Sat, Aug 7, 2021 at 2:08 PM Chris White <chris.white@...> wrote:
I dont doubt you Chris, but curious what goes wrong with the y cables?


Re: APPM Basic questions

ap@CaptivePhotons.com
 

Linwood wrote:

 

  • One last question (ok, probably never such a thing)… is there a document that explains more about the meaning of the various model properties.  Or maybe what I am asking is whether any of those values are actionable for a user – if my Tube Flexure quadrupled (for example) with the same gear, does that tell me to DO anything?   Or are these more essentially constants in a very complex curve fit designed to minimize pointing errors, and despite real world derivation may not individually mean anything?

 

So I started reading the APCC help file and found definitions of these values.  I really need a 30 minute delay on emails.  😊

 

READ THE HELP FILES NOT JUST THE MANUALS.  I’ll have that printed large somewhere near my monitor. 

 

Sigh… sorry for the interruptions.

 


Re: APPM Basic questions

ap@CaptivePhotons.com
 

Ray/Linwood Wrote:

 

  • Have you already read the APCC help section for APPM? There's lots of information in there that can get you started.

 

  • I read the manual (twice), but probably not the help file, I take it that’s different than the manual.  Tomorrow...

 

Excellent pointer.  I found all sorts of tidbits in there I had to discover otherwise.  I thought I had prepared by reading the manual (usually the help file is just portions of a manual).  Lesson learned. Read all of APPM, now going back to APCC.

 

Thank you.

 

  • My main question, as related to this night, was I could only model  2/3rds of the sky, and was wondering if using that model was helpful, or pointless.  I’ll hopefully find guidance in the help file tomorrow.  Pulled it all in tonight, it got “clear” but so hazy there was no point in imaging.

 

  • No one can tell you that because every setup is different. However, you can try using the model afterwards to see how it performs.

 

Fair enough.  In reading the help file I also see how you can test a model by running shorter pointing runs to see the accuracy.  Nice.

 

I also compared my small model to an even smaller (due to clouds) and max error was almost double on the cloudy one.  So at least intuitively that makes sense.  (Still pretty small though).

 

One last question (ok, probably never such a thing)… is there a document that explains more about the meaning of the various model properties.  Or maybe what I am asking is whether any of those values are actionable for a user – if my Tube Flexure quadrupled (for example) with the same gear, does that tell me to DO anything?   Or are these more essentially constants in a very complex curve fit designed to minimize pointing errors, and despite real world derivation may not individually mean anything?

 

Linwood

 

PS. If the clouds would abate I would be less interested in theory.  😊   Last night I waited about 3.5 hours and it stayed high hazy clouds, so I pulled everything in early.  But at least I got to practice.  Despite the clouds guiding around 0.3” steadily.  Goto landed the target right in the center (at least to the eye). Darn fine hardware/software!


Re: PSA- Check your gear mesh! (Older mounts)

M Hambrick
 

I set up and take down my 1100 mount every night that I use it. In doing so I found that running the Y-cable outside the mount instead of through it saves several minutes of setup and takedown time. Astro-Physics sells a longer version of the Y-cable for this purpose, but the tradeoff is that even though the cable is longer, it can still get caught on the various knobs and projections when slewing the mount. If this happens the cable can be seriously damaged.

You would be surprised how quickly a cable can get snagged when the mount is slewing at 600 or 1200X. I have learned the hard way to pay close attention to cable management and to keep a finger on the keypad stop button any time I am slewing the mount. In one incident I was slewing the mount and failed to check my camera cables. The main power cable to my camera got caught between one of the DEC axis clutch knobs and gearbox housing and it completely cut through the outer insulation and severed a couple of the individual conductors.


Re: APPM Basic questions

Ray Gralak
 

My main question, as related to this night, was I could only model 2/3rds of the sky, and was wondering if using
that model was helpful, or pointless. I’ll hopefully find guidance in the help file tomorrow. Pulled it all in tonight, it
got “clear” but so hazy there was no point in imaging.
No one can tell you that because every setup is different. However, you can try using the model afterwards to see how it performs.

I do tear down completely. I try to reproduce the same setup by setting the tripod legs into drilled holes, but there’s
always some slop from wheeling it in and out, removing and reinstalling the OTA, etc. I have no faith a prior
model would be valid. Maybe I can do some on consecutive nights and see how they vary.
If you can reproduce the position of everything, especially polar alignment, then the model should be re-usable. Only be actually trying this will you know.

-Ray


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of ap@CaptivePhotons.com
Sent: Saturday, August 7, 2021 9:55 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APPM Basic questions

Ray wrote:



* Have you already read the APCC help section for APPM? There's lots of information in there that can get
you started.



I read the manual (twice), but probably not the help file, I take it that’s different than the manual. Tomorrow...



My main question, as related to this night, was I could only model 2/3rds of the sky, and was wondering if using
that model was helpful, or pointless. I’ll hopefully find guidance in the help file tomorrow. Pulled it all in tonight, it
got “clear” but so hazy there was no point in imaging.



* If you don’t tear down or significantly change your setup, you can usually use the same model for many
nights. However, if the model starts to become inaccurate, then you may need to redo it. For example, if the polar
alignment changes because of mount settling, or the temperature change is significant enough to measurably
change equipment flexure.



I do tear down completely. I try to reproduce the same setup by setting the tripod legs into drilled holes, but there’s
always some slop from wheeling it in and out, removing and reinstalling the OTA, etc. I have no faith a prior
model would be valid. Maybe I can do some on consecutive nights and see how they vary.



* BTW, if it is just shifting polar alignment causing an issue, you might try tweaking polar alignment outside of
APCC (e.g. via PEMPro, SharpCap, PHD2, polar alignment scope, etc.). Then do a RECAL in APPM, and the
model should work well again.



I do a polar alignment first thing, either Sharpcap or NINA (they do agree).



Thanks for the response.



Linwood



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