Date   

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!


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

Roland Christen
 

I don't see any screen shots

Roland



-----Original Message-----
From: Andrew J <andjones132@...>
To: main@ap-gto.groups.io
Sent: Fri, Oct 8, 2021 4:43 pm
Subject: Re: [ap-gto] Fine tuning PHD2 settings for 1100 with Encoders #Guiding

On Fri, Oct 8, 2021 at 01:39 PM, Roland Christen wrote:
ld let the mount track and record the tracking grap
Hi Roland.

Thank you for taking the time reply. I really appreciate the help. The main reason ordered the 1100 with Encoders is I was hoping my guiding would significantly improve and maybe even get to the point where could image without guiding at all.

I have change the delay to 2000ms. The 10s delay seemed like a bit long, but was willing to give it a try. 

Regarding, letting the mount track without guiding, I think that is pretty much what the PHD2 Guiding Assistant does (see screen shot). After letting it run for about 5 mins it reported a total RMS of around 0.23 arc-sec. It then recommend the MinMo of 0.20 for RA and 0.30 for DEC (never understood why these number need to be different). I tried bumping this up a bit during the night, but it didn't seem to help much.

I just was not sure if the results I was getting was just the best I should expect given my crappy skies here in Houston, or if I was just not fully dialed in. What always bugs me is to see my DEC axis jumping around. If I am polar aligned, which both PemPro and PHD2 say I am, then I would not expect much movement in my DEC, but it is jumping all over the place. I tried turning down the aggression as a lot of the gyrations look like over corrections. Maybe I just need to keep turning down the aggression in PHD to get rid of those spikes?

Andrew

--
Roland Christen
Astro-Physics


1600GTO notification

 

If you are interested in the 1600GTO mount and had signed up previously with the NotifyMe button, I urge you to check your emails periodically. We started our notification process on September 27.

 

The notification emails that we send out will have a deadline for you to contact us before we move on to the next person on the list.  Since the NotifyMe button only allows you to enter your email address, that is the only means that we have to contact you. Don’t miss your opportunity to order yours!

 

If you have not signed up, we invite you to do so. Just click the NotifyMe button for any of the 1600 webpages (1600GTO, 1600GTO-AE oar 1600GTO-AEL). You do not need to decide on encoders at the time you sign up and there is no obligation.

 

We plan to begin shipping these mounts shortly after the beginning of the new year.

 

Clear Skies,

Marj Christen

Astro-Physics

11250 Forest Hills Road

Machesney Park, IL 61115

Phone: 815-282-1513

www.astro-physics.com

 


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

Terry Martin
 

"the further north and near the leeward side of mountains, the worse the seeing"

Oh ya, I can attest to that!  I am so envious when I hear of people talk about 0.3 arc/sec better or total RMS guiding.

But luckily I have a Mach2 that saves the day.

Terry


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

 

Hi Andrew

can you please upload your guidelog for that session. I assume you followed the baseline guiding steps?

screen captures are interesting but aren't helpful for analysis

On Fri, Oct 8, 2021 at 2:43 PM Andrew J <andjones132@...> wrote:
On Fri, Oct 8, 2021 at 01:39 PM, Roland Christen wrote:
ld let the mount track and record the tracking grap
Hi Roland.

Thank you for taking the time reply. I really appreciate the help. The main reason ordered the 1100 with Encoders is I was hoping my guiding would significantly improve and maybe even get to the point where could image without guiding at all.

I have change the delay to 2000ms. The 10s delay seemed like a bit long, but was willing to give it a try. 

Regarding, letting the mount track without guiding, I think that is pretty much what the PHD2 Guiding Assistant does (see screen shot). After letting it run for about 5 mins it reported a total RMS of around 0.23 arc-sec. It then recommend the MinMo of 0.20 for RA and 0.30 for DEC (never understood why these number need to be different). I tried bumping this up a bit during the night, but it didn't seem to help much.

I just was not sure if the results I was getting was just the best I should expect given my crappy skies here in Houston, or if I was just not fully dialed in. What always bugs me is to see my DEC axis jumping around. If I am polar aligned, which both PemPro and PHD2 say I am, then I would not expect much movement in my DEC, but it is jumping all over the place. I tried turning down the aggression as a lot of the gyrations look like over corrections. Maybe I just need to keep turning down the aggression in PHD to get rid of those spikes?

Andrew



--
Brian 



Brian Valente


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

Andrew J
 

On Fri, Oct 8, 2021 at 01:39 PM, Roland Christen wrote:
ld let the mount track and record the tracking grap
Hi Roland.

Thank you for taking the time reply. I really appreciate the help. The main reason ordered the 1100 with Encoders is I was hoping my guiding would significantly improve and maybe even get to the point where could image without guiding at all.

I have change the delay to 2000ms. The 10s delay seemed like a bit long, but was willing to give it a try. 

Regarding, letting the mount track without guiding, I think that is pretty much what the PHD2 Guiding Assistant does (see screen shot). After letting it run for about 5 mins it reported a total RMS of around 0.23 arc-sec. It then recommend the MinMo of 0.20 for RA and 0.30 for DEC (never understood why these number need to be different). I tried bumping this up a bit during the night, but it didn't seem to help much.

I just was not sure if the results I was getting was just the best I should expect given my crappy skies here in Houston, or if I was just not fully dialed in. What always bugs me is to see my DEC axis jumping around. If I am polar aligned, which both PemPro and PHD2 say I am, then I would not expect much movement in my DEC, but it is jumping all over the place. I tried turning down the aggression as a lot of the gyrations look like over corrections. Maybe I just need to keep turning down the aggression in PHD to get rid of those spikes?

Andrew


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

Roland Christen
 

First I would let the mount track and record the tracking graph with corrections turned off. That will give you a baseline of the amount of natural sky scintillation (or seeing) that your site is experiencing. You cannot guide out seeing, so that will be the best you can do on that particular night. It depends on where your setup is located, of course - the further north and near the leeward side of mountains, the worse the seeing. The further south you are, and closer to the Gulf, the steadier the seeing will be.
You need to establish a baseline so that you don't have any unrealistic expectations about achieving a certain rms guiding error. Watching the Dec axis fluctuations over a 5 minute period is the best way to see that because the Dec motor will be sitting exactly still and any fluctuations or P-P value will be caused only by the atmosphere above. Of course you don't want to do this with the model running, and also you want to disregard any drift due to polar misalignment, atmospheric refraction, etc.

Set a 10 second "time lapse" between exposures
Second, I would cut my guide exposure to between 2 and 3 seconds and drop the 10 second delay down to 2 to 3 seconds.

Rolando

-----Original Message-----
From: Andrew J <andjones132@...>
To: main@ap-gto.groups.io
Sent: Fri, Oct 8, 2021 3:25 pm
Subject: [ap-gto] Fine tuning PHD2 settings for 1100 with Encoders #Guiding

We finally got a clear night and I was finally able to create a pointing model and attempt my first imaging run last night with my 1100GTO-AEL. I created about a 200 point model and setup PHD2 following some helpful advice from Brian Valente here on this forum back in July.
 
Here are my settings:
 
  • Used Guiding Assistant to set the RA/DEC MinMo by letting it run for about 5 mins
  • Set sidereal guide rate to 1x
  • Use 4 second guiding exposures
  • Set a 10 second "time lapse" between exposures
  • Use lowpass 2 algorithm on both RA and DEC
  • Set Medium aggressiveness (I used 65 for RA and 80 for DEC)
  • Don’t use backlash compensation


Although my guiding was much better than I ever got with my Mach1, I still think there might be some room for improvement. Here is the graph that I had at the end of the session that was fairly representative of what I saw earlier in the night. I tried fumbling with the MinMo and Aggressive settings to try and smooth it out a bit, but was unable to get a better result. I would welcome any recommendation on how I can improve my settings or things to try.
 
Thanks in the advance for the help

Andrew J

--
Roland Christen
Astro-Physics


Fine tuning PHD2 settings for 1100 with Encoders #Guiding

Andrew J
 

We finally got a clear night and I was finally able to create a pointing model and attempt my first imaging run last night with my 1100GTO-AEL. I created about a 200 point model and setup PHD2 following some helpful advice from Brian Valente here on this forum back in July.

 

Here are my settings:

 

  • Used Guiding Assistant to set the RA/DEC MinMo by letting it run for about 5 mins
  • Set sidereal guide rate to 1x
  • Use 4 second guiding exposures
  • Set a 10 second "time lapse" between exposures
  • Use lowpass 2 algorithm on both RA and DEC
  • Set Medium aggressiveness (I used 65 for RA and 80 for DEC)
  • Don’t use backlash compensation


Although my guiding was much better than I ever got with my Mach1, I still think there might be some room for improvement. Here is the graph that I had at the end of the session that was fairly representative of what I saw earlier in the night. I tried fumbling with the MinMo and Aggressive settings to try and smooth it out a bit, but was unable to get a better result. I would welcome any recommendation on how I can improve my settings or things to try.

 

Thanks in the advance for the help

Andrew J

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