Date   

Re: [ap-ug] [ap-gto] Two videos about the AP 175 F/8 refractor

thefamily90 Phillips
 

No, silver is on the inside. I have been using Telegizmos 365 tarps for many years. Tony has it correct.

JimP


From: main@ap-ug.groups.io <main@ap-ug.groups.io> on behalf of dvjbaja <jpgleasonid@...>
Sent: Monday, October 11, 2021 11:40:17 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Cc: astrocnc@... <astrocnc@...>; main@ap-ug.groups.io <main@ap-ug.groups.io>
Subject: Re: [ap-ug] [ap-gto] Two videos about the AP 175 F/8 refractor
 
The telegizmos cover is inside out is it not? Silver on the outside to reflect sunlight.  

On Mon, Oct 11, 2021 at 8:22 AM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
Attaching the 175 refractor with dovetail is doing it the hard way. Unless you're a wrestler. I first attach the dovetail and rings to the mount and open the rings. Then I simply lift the tube into the rings, close them and voila! the deed is done.

Rolando

-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: main@ap-ug.groups.io <main@ap-ug.groups.io>; main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Sun, Oct 10, 2021 3:51 pm
Subject: [ap-gto] Two videos about the AP 175 F/8 refractor

I have two more videos.

TeleGizmos T3R6 All Weather Cover with an Astro Physics 175 f/8 EDF Refractor
https://www.youtube.com/watch?v=HW37FjtnOew


Attaching A Large Refractor Telescope (by yourself) to an Equatorial mount Astro Physics 175 f/8 EDF
https://www.youtube.com/watch?v=Vy2GNNHdErA


tony


--
Roland Christen
Astro-Physics


Re: Two videos about the AP 175 F/8 refractor

dvjbaja
 

The telegizmos cover is inside out is it not? Silver on the outside to reflect sunlight.  


On Mon, Oct 11, 2021 at 8:22 AM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
Attaching the 175 refractor with dovetail is doing it the hard way. Unless you're a wrestler. I first attach the dovetail and rings to the mount and open the rings. Then I simply lift the tube into the rings, close them and voila! the deed is done.

Rolando

-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: main@ap-ug.groups.io <main@ap-ug.groups.io>; main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Sun, Oct 10, 2021 3:51 pm
Subject: [ap-gto] Two videos about the AP 175 F/8 refractor

I have two more videos.

TeleGizmos T3R6 All Weather Cover with an Astro Physics 175 f/8 EDF Refractor
https://www.youtube.com/watch?v=HW37FjtnOew


Attaching A Large Refractor Telescope (by yourself) to an Equatorial mount Astro Physics 175 f/8 EDF
https://www.youtube.com/watch?v=Vy2GNNHdErA


tony


--
Roland Christen
Astro-Physics


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Roland Christen
 


I recently acquired and setup a Unihedron SQM meter thinking it might help determine my Seeing. My best readings recently have been Naked-Eye Limiting Magnitude (NELM) of ~4.4 and Mag/sq Arcsec (MPSAS) of ~18.5, which translates into a White/City Sky Bortle value. Based on what you have said above, I interpret this to mean that all this meter will do is help me determine is my Transparency. It will not help determine my Seeing. Is this a correct interpretation?
Yes, SQM meters will not determine seeing. They determine the combination of transparency and light pollution levels. Has nothing to do with seeing.

Rolando


-----Original Message-----
From: Andrew J <andjones132@...>
To: main@ap-gto.groups.io
Sent: Mon, Oct 11, 2021 9:37 am
Subject: Re: [ap-gto] Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Hi Roland.

Thank you for your feedback. I will get the screen shots with no guiding corrections after I let it run for 5 - 10 mins. Unfortunately, clouds have rolled in again and not expected to clear again until next weekend. I will revive this thread once I have the screen shots. 

Some explanation of terms:
 
Seeing is simply the amount of random motion that a star exhibits due to various atmospheric effects. It is usually expressed in P-P arc seconds. Knowing that value allows setting the Min Move.
 
P-P is the maximum fluctuation above and below the zero point with drift component removed.
 
RMS is a good indicator of the amount of error that is added to the theoretical FWHM star size of your optical setup. For example if your system's theoretical resolution is 2 arc sec FWHM and the RMS is 0.5, then the star size will increase to approximately 2.5 arc sec FWHM. RMS is typically 1/4 of the P-P value.
 
Seeing has zero to do with light pollution or Bortle or transparency or whether you are in the country or in the middle of a large metropolis. Seeing can be superb when the sky is super hazy and you can see no stars but only bright objects like the planets and the Moon. Seeing can be particularly bad when the sky is super transparent and you can see mag7 stars with the unaided eye. Do not confuse seeing with transparency.
 
 
Thank you for explanation of the termination around of Seeing . I must admit I still struggle to get my head around this. I understand the concept that we need to let PHD2 run unguided for a period of time to determine the Seeing on a given night and use that information to set the MinMo in PHD2. However, I still struggle with how to get the necessary inputs. For example, once I have an unguided PHD2 Graph, how can I determine my P-P arc seconds seeing? How can I determine what is the theoretical FWHM of my system? Once I know the P-P arc seconds seeing and my systems theoretical FWHM, how can I derive the best MinMo settings for a given imaging session? I thought all I needed was to get the Total RMS from the Guiding Assistant and the use this to determine my MinMo. That said, I have not been able to understand the relationship between the Total RMS and what PHD2 recommends as the MinMo values. Maybe once I publish the unguided screenshots you or some of the gurus here can help explain how to interpret and extract the required information from the graph and feed that information into the guiding algorithms. A explanation using screenshots I think would be really helpful (at least for me).
 
I recently acquired and setup a Unihedron SQM meter thinking it might help determine my Seeing. My best readings recently have been Naked-Eye Limiting Magnitude (NELM) of ~4.4 and Mag/sq Arcsec (MPSAS) of ~18.5, which translates into a White/City Sky Bortle value. Based on what you have said above, I interpret this to mean that all this meter will do is help me determine is my Transparency. It will not help determine my Seeing. Is this a correct interpretation?
 
I appreciate that this is not a PHD2 forum, but I trust the expertise and recommendations that I receive here over what I might find on other forums. Plus I really want to see how this applies specifically to AP mounts with encoders. I do think getting a solid understanding of these concepts can help us get the most out of our mounts.
 
 Andrew

--
Roland Christen
Astro-Physics


Re: Two videos about the AP 175 F/8 refractor

Roland Christen
 

Attaching the 175 refractor with dovetail is doing it the hard way. Unless you're a wrestler. I first attach the dovetail and rings to the mount and open the rings. Then I simply lift the tube into the rings, close them and voila! the deed is done.

Rolando

-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: main@ap-ug.groups.io <main@ap-ug.groups.io>; main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Sun, Oct 10, 2021 3:51 pm
Subject: [ap-gto] Two videos about the AP 175 F/8 refractor

I have two more videos.

TeleGizmos T3R6 All Weather Cover with an Astro Physics 175 f/8 EDF Refractor
https://www.youtube.com/watch?v=HW37FjtnOew


Attaching A Large Refractor Telescope (by yourself) to an Equatorial mount Astro Physics 175 f/8 EDF
https://www.youtube.com/watch?v=Vy2GNNHdErA


tony


--
Roland Christen
Astro-Physics


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Andrew J
 

Hi Brian.

Thank you for taking the time to review the data and for providing guidance on how to upload my guide logs in the future. Once we get some clear skies here again, I will try and aquire the necessary data. As mentioned in another post, I am still struggling to get my head around some of these key concepts even thou I have been imaging since 2016. I have read and researched this on my own the best I can, but I obviously still don't get it. I am determined to get this figured out so I can get the most out of my AP mount (and maybe help others who struggle with this as well). I gues Push Hear Dummy is still not dumbed down enough for me... :)

Andrew


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Andrew J
 

Hi Roland.

Thank you for your feedback. I will get the screen shots with no guiding corrections after I let it run for 5 - 10 mins. Unfortunately, clouds have rolled in again and not expected to clear again until next weekend. I will revive this thread once I have the screen shots. 

Some explanation of terms:

 

Seeing is simply the amount of random motion that a star exhibits due to various atmospheric effects. It is usually expressed in P-P arc seconds. Knowing that value allows setting the Min Move.

 

P-P is the maximum fluctuation above and below the zero point with drift component removed.

 

RMS is a good indicator of the amount of error that is added to the theoretical FWHM star size of your optical setup. For example if your system's theoretical resolution is 2 arc sec FWHM and the RMS is 0.5, then the star size will increase to approximately 2.5 arc sec FWHM. RMS is typically 1/4 of the P-P value.

 

Seeing has zero to do with light pollution or Bortle or transparency or whether you are in the country or in the middle of a large metropolis. Seeing can be superb when the sky is super hazy and you can see no stars but only bright objects like the planets and the Moon. Seeing can be particularly bad when the sky is super transparent and you can see mag7 stars with the unaided eye. Do not confuse seeing with transparency.

 

 

Thank you for explanation of the termination around of Seeing . I must admit I still struggle to get my head around this. I understand the concept that we need to let PHD2 run unguided for a period of time to determine the Seeing on a given night and use that information to set the MinMo in PHD2. However, I still struggle with how to get the necessary inputs. For example, once I have an unguided PHD2 Graph, how can I determine my P-P arc seconds seeing? How can I determine what is the theoretical FWHM of my system? Once I know the P-P arc seconds seeing and my systems theoretical FWHM, how can I derive the best MinMo settings for a given imaging session? I thought all I needed was to get the Total RMS from the Guiding Assistant and the use this to determine my MinMo. That said, I have not been able to understand the relationship between the Total RMS and what PHD2 recommends as the MinMo values. Maybe once I publish the unguided screenshots you or some of the gurus here can help explain how to interpret and extract the required information from the graph and feed that information into the guiding algorithms. A explanation using screenshots I think would be really helpful (at least for me).

 

I recently acquired and setup a Unihedron SQM meter thinking it might help determine my Seeing. My best readings recently have been Naked-Eye Limiting Magnitude (NELM) of ~4.4 and Mag/sq Arcsec (MPSAS) of ~18.5, which translates into a White/City Sky Bortle value. Based on what you have said above, I interpret this to mean that all this meter will do is help me determine is my Transparency. It will not help determine my Seeing. Is this a correct interpretation?

 

I appreciate that this is not a PHD2 forum, but I trust the expertise and recommendations that I receive here over what I might find on other forums. Plus I really want to see how this applies specifically to AP mounts with encoders. I do think getting a solid understanding of these concepts can help us get the most out of our mounts.

 

 Andrew


Re: Two videos about the AP 175 F/8 refractor

Andrea Lucchetti
 

Tony,
If I got it, when you leave the OTA it doesn’t flip because the center of mass is inside the dovetail base. If the OTA is bigger or the latitude higher is this something to check to avoid flipping? Thank you
Andrea 


Two videos about the AP 175 F/8 refractor

Harley Davidson
 

I have two more videos.

TeleGizmos T3R6 All Weather Cover with an Astro Physics 175 f/8 EDF Refractor
https://www.youtube.com/watch?v=HW37FjtnOew


Attaching A Large Refractor Telescope (by yourself) to an Equatorial mount Astro Physics 175 f/8 EDF
https://www.youtube.com/watch?v=Vy2GNNHdErA


tony


Re: AP 1100 part

Roland Christen
 

Ask AP to send you one. Call them tomorrow.

Rolando



-----Original Message-----
From: Claude Benoit via groups.io <Isphotoman@...>
To: main@ap-gto.groups.io
Sent: Sun, Oct 10, 2021 10:32 am
Subject: [ap-gto] AP 1100 part

I've lost the motor cable plug adapter retaining nut that holds it tight in the casing. When I plug in the cable in it moves inwards and wiggles.  I was wondering how I would go about getting another one?
 Photo of the plug attached.

Thank you for your repsonse
Claude


--
Roland Christen
Astro-Physics


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

 

Hi Andrew

In general it looks good, but I think the main limiter for you is your min move is set too high.

You are achieving about 0.5" RMS with DEC and RA nearly identical, and it turns out your min moves are about 0.5", so you aren't going to get better unless you adjust them lower. 

Also for future reference when you upload guidelogs, it's helpful to include a calibration run and as Roland mentioned an unguided run of 10-15 minutes to see what the mount performance and seeing look like


Brian


AP 1100 part

Claude Benoit
 

I've lost the motor cable plug adapter retaining nut that holds it tight in the casing. When I plug in the cable in it moves inwards and wiggles.  I was wondering how I would go about getting another one?
 Photo of the plug attached.

Thank you for your repsonse
Claude


Re: Dec Arc APPM mode: any l best practices for field set up

Max Mirot
 

I will try again.

Thanks


Re: Dec Arc APPM mode: any l best practices for field set up

Ray Gralak
 

Hi Max,

My guess is that there weren't enough points in each dec arc row near where you were trying to image. There should be at least 5 points, but more is better. A good rule of thumb is to use a 5-degree (or less) spacing for both RA and Dec to get a nice sky grid.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Max Mirot via groups.io
Sent: Saturday, October 9, 2021 4:15 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dec Arc APPM mode: any l best practices for field set up

I am getting poor results so far with the Dec arc tracking model on my AP1100 and AP Honders 305 combo.

First I made an all sky tracking model using 250 points.
I checked the Dec arc box and did 10 minutes.
The Image showed big ovals nearly short trails.
The standard model was nearly round at 10 minutes in the same area.

Next night I acquired new images with APPM. This was a single 15 point arc at the Dec only.
I got trailing across the entire image at 10 minutes.

APPM mapped a point near zenith in addition to the Dec arc.
I removed the zenith point from the calculation and model improved to long ovals again.

I tell ya , I get no respect. No respect at all ...

Max


Re: Dec Arc APPM mode: any l best practices for field set up

Max Mirot
 

I am getting poor results so far with the Dec arc tracking model on my AP1100 and AP Honders 305 combo.

First I made an all sky tracking model using 250 points.
I checked the Dec arc box and did 10 minutes.
The Image showed big ovals nearly short trails.
The standard model was nearly round at 10 minutes in the same area.

Next night I acquired new images with APPM. This was a single 15 point arc at the Dec only.
I got trailing across the entire image at 10 minutes.

APPM mapped a point near zenith in addition to the Dec arc.
I removed the zenith point from the calculation and model improved to long ovals again.

I tell ya , I get no respect. No respect at all ...

Max


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Roland Christen
 

I would like to see a screen shot of the RA and Dec with no guide corrections. That will tell what the baseline seeing is in your area. This is the minimum that you can expect and cannot be bettered when guiding. This is fundamental in understanding of what tracking and guiding does. Without that simple test I cannot really evaluate your setup and what you can expect the rms guiding to be.

Some explanation of terms:

Seeing is simply the amount of random motion that a star exhibits due to various atmospheric effects. It is usually expressed in P-P arc seconds. Knowing that value allows setting the Min Move.

P-P is the maximum fluctuation above and below the zero point with drift component removed.

RMS is a good indicator of the amount of error that is added to the theoretical FWHM star size of your optical setup. For example if your system's theoretical resolution is 2 arc sec FWHM and the RMS is 0.5, then the star size will increase to approximately 2.5 arc sec FWHM. RMS is typically 1/4 of the P-P value.

Seeing has zero to do with light pollution or Bortle or transparency or whether you are in the country or in the middle of a large metropolis. Seeing can be superb when the sky is super hazy and you can see no stars but only bright objects like the planets and the Moon. Seeing can be particularly bad when the sky is super transparent and you can see mag7 stars with the unaided eye. Do not confuse seeing with transparency.

Rolando



-----Original Message-----
From: Andrew J <andjones132@...>
To: main@ap-gto.groups.io
Sent: Sat, Oct 9, 2021 4:00 pm
Subject: Re: [ap-gto] Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Hi Roland.

It maybe that the screen shots don't show up on all clients. I can see them when logged into groups.io on my pc.

Andrew

--
Roland Christen
Astro-Physics


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Andrew J
 

Hi Roland.

It maybe that the screen shots don't show up on all clients. I can see them when logged into groups.io on my pc.

Andrew


Re: Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Andrew J
 

Hi Brian.

Here is a link to my logs from my last imaging session. Hope they help.

https://openphdguiding.org/logs/dl/PHD2_logs_nBLW.zip
--
Andrew


Re: Seeking CP3 Control Box with V2 Chip

Chris White
 

On Fri, Oct 8, 2021 at 11:33 AM, Howard Hedlund wrote:
Periodic error is a mechanical characteristic of a worm screw gear.  A PE curve is simply a measurement of that error.  It's validity for making corrections is entirely dependent on the synchrony between the worm's actual physical rotational position and the position address in the GTOCPx.  This is often referred to as its phase.  The worm screw is not indexed.  The GTOCPx can only assume that this synchrony is maintained and is correct.  It cannot ascertain that positional or phase value afresh.  This is where the difficulty arises in swapping control boxes.
It does not matter if the axis is moved or kept perfectly still.
It does not matter that the old curve was saved and reloaded into the new box.
There is currently no way to re-establish the proper phase when you swap boxes (...or when you move the gears by hand without the servo, or when you do anything else to break the phase synchrony.)    
This will soon be a problem of the past.  There will be a solution using the AP SerialUtility.jar.  I believe that all we need at this point is for me to get the time to write up instructions and do a little more testing. 


Thanks Howard!  Appreciate the reply and looking forward to the new feature.  :-)

To everyone else, I found a CP3 unit.  Thank you!


Re: APCC: RA limit reached while in Park 3? #APCC

Glenn
 

Ray and Howard, this suggestion did the trick! Thanks so much for your help. 

Best,

Glenn


Re: Seeking CP3 Control Box with V2 Chip

Chris White
 

On Fri, Oct 8, 2021 at 09:51 AM, Catherine Hyde wrote:
Hi Chris. I just upgraded to the CP4 box, so I do in fact have a 3 lying around, and yes it does have the upgraded V2 chip and running 4.19.3 firmware. I was going to sell it on Astromart but hadn't yet. 
Hello Catherine.  I am interested and sent a PM earlier, but not sure I did it right. Thanks!

4861 - 4880 of 86825