Date   

Re: Guider exposure times?

Mike Shade
 

Thanks for the input on this.  As we are now in the heat in SE AZ, there is a bit of ground heating during the day, in spite of my tree planting 20 years ago.  I did notice with the shorter guide exposures, the error graph in Maxim looked better, smoother and there was significantly less variation.  I did a series of tests last night pointing the scope at various elevations and doing a 1 minute unguided shot.  I was testing for some sort of sag or flexure in the optical components.  The results were interesting.  I shot at 85, 75, 65, 55, and 45 degrees elevation, pointed E, W, and then S.  In a series of several at the same location, the stars were all sorts of interesting shapes...round, ovoid in one direction, ovoid in another direction.  As there was no guiding, the only "live" axis was RA and the deviations were not tracking errors as they were not in line with this axis.  Interesting demonstration, at least to me of the effects of seeing variations.

 

Mike J. Shade

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Mike Shade
Sent: Thursday, April 30, 2020 8:53 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] Guider exposure times?

 

Curious as to what people have for guider exposures for various systems.  Was having some issues guiding my 1600/CDK 17/Maxim 5.18/STL6303E (guiding with camera) in that the stars were not always round...almost but not quite, just a few pixels but enough to oblong the stars.  Always had somewhat longer guide exposures (7"-10") to try and even out seeing variations (which can be quite large with a 17" telescope).  The system can go unguided with reasonably round stars for the 382" worm cycle near zenith but guided images were a different story (I do need to guide the system).  So last night lowered the guide exposure to 2", aggressiveness to 5 and round guided stars.  What I think might have been happening is that with a longer guider exposure, there would be centroid changes between exposures and the system was reacting to these.  With a shorter exposure, this is not happening as the "deviation" is not allowed.

 

So, just curious as to what others have their systems setup for guiding and if my thinking on this makes sense.

 

Mike J. Shade

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


Re: Diagram of (top of) Eagle Pier

fd@...
 

What a coincidence.  I am designing a top for my Eagle Pier so I can mount a tracker on it.  Now that my Mach1GTO is on a permanent pier, I want to put my Eagle to good use.

I based my design on the drawing of the ADATRI adapter that fits on a pier and holds my Mach1GTO. 

Mechanical drawing of what I came up with so far:

I decided to 3D print the part so I made a couple changes to dimensions, for example the three side holeshttps://imgur.com/0bcY90Zhttps://imgur.com/0bcY90Zhttps://imgur.com/0bcY90Zhttps://imgur.com/0bcY90Z are bigger to accommodate barbed brass inserts.


--
Mach1GTO and GTOCP4 on permanent pier


Getting Files from Remote Systems

Wayne Hixson
 

Looking for ideas on ways to get image data from remote sites. I’ve got an Eagle 3S running my system and storing data on its hard drive. I then connect from my local pc the next morning and download the data. With my current 26 megapixel 16-bit camera each sub is 51MB. With short subs that can add up to multi-gigabytes. I’m wondering if there is a way to incrementally transfer the files as they’re created using one of those folder real-time sync programs? Or other solution?


Re: Where to download PEMpro

David Enck
 

Thank you Ray, your link you pointed out worked! :-)

Cheers,

David


Re: Where to download PEMpro

Bill Long
 

Should be able to get it from www.ccdware.com



From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of davidenck@... <davidenck@...>
Sent: Thursday, April 30, 2020 11:11 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: [ap-gto] Where to download PEMpro
 

Hello,

Can someone please tell me where to officially download PEMpro? I have tried from the link at ccdware, but my virus scanner keeps warning me with a trojan so I canceled it. I got a new computer and can not recall the link I used on my old one..

Thank you,

David


Re: Where to download PEMpro

Ray Gralak
 

David,

 

I think you are trying to download using the wrong link on the CCDware downloads page. There is a link just above the PEMPro section to another download that is susceptible to getting virus check errors.

 

The link for the PEMPro download is below the PEMPro section, not above it. Here is a screen shot:

 

 

CCDWare link:

 

https://www.ccdware.com/downloads/

 

-Ray Gralak

Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro

Author of PEMPro V3:  https://www.ccdware.com

Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

 

 

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

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

> Sent: Thursday, April 30, 2020 11:12 AM

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

> Subject: [ap-gto] Where to download PEMpro

>

> Hello,

>

> Can someone please tell me where to officially download PEMpro? I have tried from the link at ccdware, but my

> virus scanner keeps warning me with a trojan so I canceled it. I got a new computer and can not recall the link I

> used on my old one..

>

> Thank you,

>

>

>

> David

>


Where to download PEMpro

David Enck
 

Hello,

Can someone please tell me where to officially download PEMpro? I have tried from the link at ccdware, but my virus scanner keeps warning me with a trojan so I canceled it. I got a new computer and can not recall the link I used on my old one..

Thank you,

David


Re: Guider exposure times?

Charles Thompson
 

I use 2 seconds for all my different scope/guidescope configurations in PhD2. I image from an area with considerable light pollution but don't know if that really matters. 





Thanks,
Charles

Sent from mobile device.


-------- Original message --------
From: Mike Shade <mshade@q.com>
Date: 4/30/20 10:53 AM (GMT-06:00)
To: main@ap-gto.groups.io
Subject: [ap-gto] Guider exposure times?

Curious as to what people have for guider exposures for various systems.  Was having some issues guiding my 1600/CDK 17/Maxim 5.18/STL6303E (guiding with camera) in that the stars were not always round...almost but not quite, just a few pixels but enough to oblong the stars.  Always had somewhat longer guide exposures (7"-10") to try and even out seeing variations (which can be quite large with a 17" telescope).  The system can go unguided with reasonably round stars for the 382" worm cycle near zenith but guided images were a different story (I do need to guide the system).  So last night lowered the guide exposure to 2", aggressiveness to 5 and round guided stars.  What I think might have been happening is that with a longer guider exposure, there would be centroid changes between exposures and the system was reacting to these.  With a shorter exposure, this is not happening as the "deviation" is not allowed.

 

So, just curious as to what others have their systems setup for guiding and if my thinking on this makes sense.

 

Mike J. Shade

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


Diagram of (top of) Eagle Pier

Mark Striebeck
 

Hi,

I want to put a different mount on top of the Eagle Pier and need to design an adapter. Does somebody have a diagram with exact dimensions of the top of it?

Thanks
     Mark


Re: Guider exposure times?

dnakic@...
 

I have AP 1600GTO with PEM training running around +/- 0.74.  I have a 14” Edge HD @f11 and imaging with STXL 11K and guiding with its SXTL filter wheel/guider.  I use Maxim DL with 8/8 X/Y aggressiveness.  Guide calibration is 4 sec and 4 sec for guide exposure.  My guiding is +/- .5 arcsec when watching the guiding trace.  My imaging with narrowband is typically 20min in duration.  Early on I noticed my STXL fan was creating vibration and causing oblong stars.  I now run with fan off, but it does go on when it reaches a critical point.  You may want to try running with fan off too.

I’m enclosing a sample of what I’m getting with this setup.


Re: Guider exposure times?

Dean Jacobsen
 

My experience has been that guiding camera exposure times will vary according to how steady the sky is.  You want to have exposures long enough to average out the seeing so you aren’t chasing a false centroid calculation by the guiding software.  For me, I want to keep my guide exposures as short as possible because I dither the guide star every one or two exposures (for better pixel rejection during stacking, “walking noise” issues with my camera, and because I frequently use drizzle integration) so I want to minimize the settling time before the next exposers is started.

I generally use 3 sec for calm nights but will use 5 sec for nights with bad seeing.

It is very instructive to watch seeing scintillation at longer focal lengths with an eyepiece and see how a star will move around.  Then you can easily see how short guide exposures will give you an inaccurate result.  Also, try taking a 1 or 2 sec exposure with your guide camera.  If the star is misshapen or elongated then you might not be getting an accurate position calculation.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: Guider exposure times?

Michael Hambrick <mike.hambrick@...>
 

It seems that I read somewhere that shorter guide exposures are better, but I am not sure where I read that. In any case I have always tried to go for 1 to 3 second guide exposures. I use Maxim DL-Pro and sometimes CCDOps. My guider aggressiveness is typically about 7 or 8.

I have never really experimented a lot with these parameters or taken the time to set up a PEC, but I suppose that I should.


Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...


Re: Guider exposure times?

Stuart <stuart.j.heggie@...>
 

Mike, I use 3 or 4 seconds with my 12.5" Planewave / MMOAG. I "think" I'm running 4 seconds with my AP155 and Borg 60mm guidescope.


On Thu, 30 Apr 2020 at 11:52, Mike Shade <mshade@q.com> wrote:

Curious as to what people have for guider exposures for various systems.  Was having some issues guiding my 1600/CDK 17/Maxim 5.18/STL6303E (guiding with camera) in that the stars were not always round...almost but not quite, just a few pixels but enough to oblong the stars.  Always had somewhat longer guide exposures (7"-10") to try and even out seeing variations (which can be quite large with a 17" telescope).  The system can go unguided with reasonably round stars for the 382" worm cycle near zenith but guided images were a different story (I do need to guide the system).  So last night lowered the guide exposure to 2", aggressiveness to 5 and round guided stars.  What I think might have been happening is that with a longer guider exposure, there would be centroid changes between exposures and the system was reacting to these.  With a shorter exposure, this is not happening as the "deviation" is not allowed.

 

So, just curious as to what others have their systems setup for guiding and if my thinking on this makes sense.

 

Mike J. Shade

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


--

Stuart
http://www.astrofoto.ca/stuartheggie/


Guider exposure times?

Mike Shade
 

Curious as to what people have for guider exposures for various systems.  Was having some issues guiding my 1600/CDK 17/Maxim 5.18/STL6303E (guiding with camera) in that the stars were not always round...almost but not quite, just a few pixels but enough to oblong the stars.  Always had somewhat longer guide exposures (7"-10") to try and even out seeing variations (which can be quite large with a 17" telescope).  The system can go unguided with reasonably round stars for the 382" worm cycle near zenith but guided images were a different story (I do need to guide the system).  So last night lowered the guide exposure to 2", aggressiveness to 5 and round guided stars.  What I think might have been happening is that with a longer guider exposure, there would be centroid changes between exposures and the system was reacting to these.  With a shorter exposure, this is not happening as the "deviation" is not allowed.

 

So, just curious as to what others have their systems setup for guiding and if my thinking on this makes sense.

 

Mike J. Shade

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


Re: Error Connecting to ASCOM Driver #ASCOM_V2_Driver

Ray Gralak
 

> I worked with George at AstroPhysics on this issue.  We reviewed all the settings and corrected those that

> needed it.   I’m enclosing an image of issue.  When I start ACCP it doesn’t AutoConnect, despite setup that way.

> But the software does connect to mount when I manual pick the box. Interested in what to do next.

 

Try setting the connection properties like this:

 

 

You don’t need to connect the ASCOM driver on APCC connect.

 

If this still doesn’t work check that you have two Virtual ports defined. If you manually defined them at some point then APCC may not try to change them, so you may need to define the virtual ports you want to use. You only need to setup the first two.

 

-Ray Gralak

Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro

Author of PEMPro V3:  https://www.ccdware.com

Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

 

 

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

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

> Sent: Wednesday, April 29, 2020 12:52 PM

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

> Subject: [ap-gto] Error Connecting to ASCOM Driver #ASCOM_V2_Driver

>

> I worked with George at AstroPhysics on this issue.  We reviewed all the settings and corrected those that

> needed it.   I’m enclosing an image of issue.  When I start ACCP it doesn’t AutoConnect, despite setup that way.

> But the software does connect to mount when I manual pick the box. Interested in what to do next.

>

> Thank,


Re: Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)

Michael 'Mikey' Mangieri
 

Indeed. The only time my Pyramid shut down was in the summer heat. That week I placed a small fan to circulate the air around it and the problem went away. 


On Apr 29, 2020, at 3:47 PM, Joe Zeglinski <J.Zeglinski@...> wrote:


Hi,
 
    You should be aware that under certain conditions, ANY Pyramid power supply, including the one sold through AP,  may NOT reset its “thermal breaker” after a dropout, for upto a half hour. So, you may give up and walk away too soon. Then all, is fine the next night, but the PYRAMID trips again. The Pyramid (old linear technology) supplies are not very efficient, but are generally well designed. Just heed their warnings and limitations.
 
    If you still have it, carefully read the Instruction Sheet.
Here is  Section #5,  which I transcribed from mine. Substitute “TRIP” ... for their word  “WORK”.
Yes, it does “work” as designed to do. The power supply breaker will trip,  eventually, even if there isn’t an immediate short circuit overload. So, any long duration or repeated mount slews, will eventually have the Pyramid protect itself, so you can take an imposed  coffee break, before going back to imaging :-)

 

(A-5)  WARNING / DEVICES.

 

THIS UNIT IS WELL BUILT WITH A WARNING!   SHUT DOWN FUNCTION.

THE WARNING / SHUT DOWN FUNCTION WILL WORK  -  UNDER THE FOLLOWING UNUSUAL STATUS:

 

1)    THIS UNIT IS USED OVER 15 MINUTES AT 100% OF RATED LOAD.

*

2)    THIS UNIT IS USED OVER 25 MINUTES AT 80% OF RATED LOAD.

*

3)        THE OUTPUT OF THIS UNIT IS SHORT-CIRCUITED/OVER LOAD/OVER TEMPERATURE

 

NOTES:

1) IF THE WARNING/ SHUT DOWN FUNCTION IS CAUSED BY THE ABOVE ITEMS # 1 AND 2 THEN THIS UNIT WILL RETURN TO NORMAL WHEN THE WARNING/SHUTDOWN FUNCTION CONTINUES TO WORK ABOUT 15-30 MINUTES.

*

2) THIS UNIT IS INTENDED TO CONTINUOUSLY WORK AT 70% OF RATED LOAD DESCRIPTION OF THE WARNING / SHUT DOWN FUNCTION:

STEP I.  THE OUTPUT SHUT SHUT DOWN.

STEP 2.  GREEN LED OF NORMAL OFF

STEP 3.  RED LED OF PROTECTION ON.

    Hope this helps explain the situation you had been having. Check you device power requirements.
When it happened to me, the overload eventually tripped the PYRAMID, and while I was away from the mount for a short while, the power supply cooled off and came alive – and the mount resumed its slew, right into the pier, before I could hit the main power switch. I wish the Pyramid would have stayed powered off, but it seems to have been designed to reset and resume without warning and “unattended operation” – NOT always a good thing.
 
Joe Z.
 
From: CurtisC via groups.io
Sent: Wednesday, April 29, 2020 3:59 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)
 
I have an observatory.  The Pyramid ordinarily doesn't get very hot.  I tested its output voltage this evening, and it tested at 13.8.  So it came back after appearing dead.  Meanwhile, the little Radio Shack p.s. is connected to the CP3.


Lunar Tracking with Horizons #APCC

dnakic@...
 

I have the most recent version of APCC and Horizons and wanting to know that when I’m in the “Track Target” mode how do I reposition the object [Moon] but still retain tracking?  According to the instructions:

Check the “Disable Close Loop Corrections” < which screen do you do this in as this selection is in the “Test Tracking” screen?
Reposition your target < can I do this in SkyX or with ASCOM V2 directional controls?
Click Offset Target at Current Position button
Uncheck the “Disable Close Loop Corrections” < do I go back to “Test Tracking” screen?  After doing this, is it now tracking correctly?

Thanks!


Error Connecting to ASCOM Driver #ASCOM_V2_Driver

dnakic@...
 

I worked with George at AstroPhysics on this issue.  We reviewed all the settings and corrected those that needed it.   I’m enclosing an image of issue.  When I start ACCP it doesn’t AutoConnect, despite setup that way.  But the software does connect to mount when I manual pick the box. Interested in what to do next.

Thank,


Re: Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)

Joe Zeglinski
 

Hi,
 
    You should be aware that under certain conditions, ANY Pyramid power supply, including the one sold through AP,  may NOT reset its “thermal breaker” after a dropout, for upto a half hour. So, you may give up and walk away too soon. Then all, is fine the next night, but the PYRAMID trips again. The Pyramid (old linear technology) supplies are not very efficient, but are generally well designed. Just heed their warnings and limitations.
 
    If you still have it, carefully read the Instruction Sheet.
Here is  Section #5,  which I transcribed from mine. Substitute “TRIP” ... for their word  “WORK”.
Yes, it does “work” as designed to do. The power supply breaker will trip,  eventually, even if there isn’t an immediate short circuit overload. So, any long duration or repeated mount slews, will eventually have the Pyramid protect itself, so you can take an imposed  coffee break, before going back to imaging :-)

 

(A-5)  WARNING / DEVICES.

 

THIS UNIT IS WELL BUILT WITH A WARNING!   SHUT DOWN FUNCTION.

THE WARNING / SHUT DOWN FUNCTION WILL WORK  -  UNDER THE FOLLOWING UNUSUAL STATUS:

 

1)    THIS UNIT IS USED OVER 15 MINUTES AT 100% OF RATED LOAD.

*

2)    THIS UNIT IS USED OVER 25 MINUTES AT 80% OF RATED LOAD.

*

3)        THE OUTPUT OF THIS UNIT IS SHORT-CIRCUITED/OVER LOAD/OVER TEMPERATURE

 

NOTES:

1) IF THE WARNING/ SHUT DOWN FUNCTION IS CAUSED BY THE ABOVE ITEMS # 1 AND 2 THEN THIS UNIT WILL RETURN TO NORMAL WHEN THE WARNING/SHUTDOWN FUNCTION CONTINUES TO WORK ABOUT 15-30 MINUTES.

*

2) THIS UNIT IS INTENDED TO CONTINUOUSLY WORK AT 70% OF RATED LOAD DESCRIPTION OF THE WARNING / SHUT DOWN FUNCTION:

STEP I.  THE OUTPUT SHUT SHUT DOWN.

STEP 2.  GREEN LED OF NORMAL OFF

STEP 3.  RED LED OF PROTECTION ON.

    Hope this helps explain the situation you had been having. Check you device power requirements.
When it happened to me, the overload eventually tripped the PYRAMID, and while I was away from the mount for a short while, the power supply cooled off and came alive – and the mount resumed its slew, right into the pier, before I could hit the main power switch. I wish the Pyramid would have stayed powered off, but it seems to have been designed to reset and resume without warning and “unattended operation” – NOT always a good thing.
 
Joe Z.
 
From: CurtisC via groups.io
Sent: Wednesday, April 29, 2020 3:59 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 CP3 pier crash!! (Similar to CP4 crash in another thread)
 
I have an observatory.  The Pyramid ordinarily doesn't get very hot.  I tested its output voltage this evening, and it tested at 13.8.  So it came back after appearing dead.  Meanwhile, the little Radio Shack p.s. is connected to the CP3.


Re: Mach1GTO RA is lurching back and forth a LOT

Roland Christen
 

If you did a balance with the worm gear backed off, you may have backed off the worm in a forbidden position. The ONLY configuration that you can back off the worm is in Park3. If you tried to back off the worm in any other position you may have accidentally scraped the worm teeth across the worm wheel and thus damaged both worm and worm wheel.

This scraping happens when you are unbalanced a lot and you disengage the worm with the lever. The axis will move suddenly and you will hear a scraping sound as the teeth run over each other. That is why we strongly recommend first doing a rough balance using the clutches, followed by a fine balance with the worm disengaged in Park3 (scope and counterweight vertical) and then moved to where the scope and counterweight are horizontal. Under no circumstances should you ever disengage the worm while counter shaft is horizontal. Same is true for the Dec axis.

Rolando



-----Original Message-----
From: fd <fd@...>
To: main <main@ap-gto.groups.io>
Sent: Wed, Apr 29, 2020 12:08 pm
Subject: [ap-gto] Mach1GTO RA is lurching back and forth a LOT

When new (November 2017) my Mach1GTO was very smooth. I could shoot 5 minute subs unguided at 480mm all night long. 

Now the RA has regular "lurches" (as I call them). See the PHD2 Guiding assistant pic below.  The RA jumps 2"-8" in the time a 5 second guide exposure is shot, THEN is steady-ish for a while. Of course these jumps are too quick to guide out.  I have run PEMPro, PEC corrected tracking seems to be about 1" RMS.   I have set the RA "backstop" a couple of times with the thumb&forefinger method.  It seems sometimes, in certain areas of the sky, the "lurching" doesn't happen.  But it happens most of the time.

Has anyone else experienced this?  Any ideas of what to try to fix it?

My setup for the following data was:
  • Mach1GTO
  • Permanent pier: 8.625" OD steel pier bolted to 12" diameter 84" deep below ground concrete pier.
  • Celestron EdgeHD 8 at f/10 2032mm focal length. Screenshots below taken at 2032mm, usually I do photography at 1422mm with this scope.
  • Losmandy D dovetail plate mounted to Celestron scope
  • MoonLite focuser
  • ZWO Off Axis Guider
  • ZWO ASI174MM Mini guide camera.
  • 0.59 arc-sec/pixel on the guide camera
  • 2x USB and 2x 18ga power wires through the mount
  • Focus controller, dew controller, and USB hub are mounted on the scope, along with numerous cables.
I have set the "backstop" on the RA motor.  The box with the motor can rock back and forth slightly but it almost takes 2 hands to move it a millimeter or so.
--
Mach1GTO and GTOCP4 on permanent pier

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