Date   

Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

CurtisC
 

Thank you. 

Unrelated to the question about the Baader, I tried your suggestion of running a couple of minutes unguided to see how the DEC axis "bobbles."  I wasn't sure what numbers I should evaluate: RMS?  Numbers from the running readout?  Eyeball the lines on the graph?


Re: Guy on Crowdy Nights needs help

 

am I the last one to hear "Crowdy" Nights? lol

I posted that resonse for you Roland 

On Thu, Oct 15, 2020 at 10:41 AM uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io> wrote:
I want to help this user, but I am not on CN, so if anyone on our user group can reach out to him, I have the answer to his problem below.

I am having trouble tracking with my AP Mach1 mount.  I am using Maxim DL, and I have set the "autoguider output control" to "telescope."
I am able to "sort of track" for an hour or so with round stars, but then it becomes impossible once the telescope has pointed much higher in the sky.
 
Calibration.  My  biggest problem is the complete inability to calibrate successfully.   When I try to calibrate, I get an angle between the x and y axes that is far, far from 90 degrees.  It is more like 130 degrees.  So I assume that the lack of calibration is at the heart of my difficulties.
 
I have tried to balance carefully, with the tube balanced first.
lantosque 

Hello,
The problem is quite simple, and you are correct that inability to calibrate will cause guiding problems. Anyone who has used MaximDL for guiding will know that Maxim is notorious for starting the calibration on one star in the field and then switch to another star half way thru the calibration procedure. This produces a bogus calibration. If you are not aware of this and try to use this calibration, then guiding accurately is impossible.

The key is to find a suitable star field that has one dominant bright star so that the program doesn't mix it up with another star in the field. You have to watch carefully during the calibration to make sure that Maxim has not switched stars. I have even seen the program switch from a star to a bright noise pixel.

So, if any of your Astronuts is also on CN, can you please let him know the above, and encourage him to come on this AP group.

Thanks,

Rolando



--
Brian 



Brian Valente


Guy on Crowdy Nights needs help

Roland Christen
 

I want to help this user, but I am not on CN, so if anyone on our user group can reach out to him, I have the answer to his problem below.

I am having trouble tracking with my AP Mach1 mount.  I am using Maxim DL, and I have set the "autoguider output control" to "telescope."
I am able to "sort of track" for an hour or so with round stars, but then it becomes impossible once the telescope has pointed much higher in the sky.
 
Calibration.  My  biggest problem is the complete inability to calibrate successfully.   When I try to calibrate, I get an angle between the x and y axes that is far, far from 90 degrees.  It is more like 130 degrees.  So I assume that the lack of calibration is at the heart of my difficulties.
 
I have tried to balance carefully, with the tube balanced first.
lantosque 

Hello,
The problem is quite simple, and you are correct that inability to calibrate will cause guiding problems. Anyone who has used MaximDL for guiding will know that Maxim is notorious for starting the calibration on one star in the field and then switch to another star half way thru the calibration procedure. This produces a bogus calibration. If you are not aware of this and try to use this calibration, then guiding accurately is impossible.

The key is to find a suitable star field that has one dominant bright star so that the program doesn't mix it up with another star in the field. You have to watch carefully during the calibration to make sure that Maxim has not switched stars. I have even seen the program switch from a star to a bright noise pixel.

So, if any of your Astronuts is also on CN, can you please let him know the above, and encourage him to come on this AP group.

Thanks,

Rolando


Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Roland Christen
 


What is your current feeling about using the Baader Vario-Finder as a guide scope?
The Vario finder works great as a guide scope with most short focus refractors, like the TEC 140.

Rolando


-----Original Message-----
From: CurtisC via groups.io <calypte@...>
To: main@ap-gto.groups.io
Sent: Thu, Oct 15, 2020 6:24 am
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Rolando: For a long time I used the Baader Vario-Finder as a guide scope with my TEC140ED (FL = 1035 mm with flattener).  The guider is an SX Superstar.  The Vario-Finder bracket (the one you sell) is mounted to the body of the focuser (Starlight Instruments 3545).  A brief email exchange with Howard a couple of months led me to go back to using the build-in OAG on my QSI 683 ("Why are you using a guide scope?").  As part of my re-evaluation of my guide settings and techniques and other matters, I've pored through hundreds of messages in this forum, going back to the forum's beginning in 2000.  There was some commentary about the Baader guide scope when you introduced it to the A-P product lineup back in 2013, but there hasn't been much since then.  What is your current feeling about using the Baader Vario-Finder as a guide scope?


Re: Unguided imaging and atmospheric refraction

Ray Gralak
 

Hi Allen,

What is the non refracted pole?
Using refraction correction while polar aligning?
Yes. Both PEMPro and APPM (in APCC Pro) will calculate polar alignment to the refracted pole.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
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 Allen Ruckle
Sent: Wednesday, October 14, 2020 8:04 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Unguided imaging and atmospheric refraction

Ray,
What is the non refracted pole?

Using refraction correction while polar aligning?

aruckle
On Sep 20, 2020, at 12:43 PM, Ray Gralak <groups3@gralak.com> wrote:



Clearly this is a complicated issue with no “perfect” answer.
There will always be a variable tracking rate depending on sky position, so the best solution is polar aligning to the
non-refracted pole.

This works for both unguided and guided setups, as it minimizes field rotation over a long period during which
images are collected.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
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 davidcfinch9 via groups.io
Sent: Sunday, September 20, 2020 12:04 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Unguided imaging and atmospheric refraction

Clearly this is a complicated issue with no “perfect” answer. The difference in refraction rates with varying
atmospheric conditions adds another level of complexity to this discussion. Without fear of “polishing cannonballs,”
I
don’t think you can go far wrong by polar aligning using your best method and then by spending the time to develop
accurate modeling for your system. You will still be subject to the whims of our atmosphere. The proof will always
be
in your images.

David








Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

CurtisC
 

Rolando: For a long time I used the Baader Vario-Finder as a guide scope with my TEC140ED (FL = 1035 mm with flattener).  The guider is an SX Superstar.  The Vario-Finder bracket (the one you sell) is mounted to the body of the focuser (Starlight Instruments 3545).  A brief email exchange with Howard a couple of months led me to go back to using the build-in OAG on my QSI 683 ("Why are you using a guide scope?").  As part of my re-evaluation of my guide settings and techniques and other matters, I've pored through hundreds of messages in this forum, going back to the forum's beginning in 2000.  There was some commentary about the Baader guide scope when you introduced it to the A-P product lineup back in 2013, but there hasn't been much since then.  What is your current feeling about using the Baader Vario-Finder as a guide scope?


Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Robert Chozick
 

The helical focuser adds no extra length since you move the tube in further to accomodate it.  The tube ends exactly in the same place as before inside of the extension at the end and is much easier to focus.





On Oct 14, 2020, at 5:07 PM, uncarollo2 <chris1011@...> via groups.io <chris1011@...> wrote:

Adding a Crayford focuser will make the system unstable (flex) and defeat the purpose of the finder as a guide scope.

Rolando



-----Original Message-----
From: George <george@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Wed, Oct 14, 2020 4:21 pm
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Bob,
 
As a reminder, the Baader finder uses the locking ring and lens as a fine focuser.
 
Regards,
 
George
 
George Whitney
Astro-Physics, Inc.
Phone:  815-222-6538 (direct line)
Phone:  815-282-1513 (office)
Email:  george@...
 
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Woody Schlom
Sent: Wednesday, October 14, 2020 3:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
 
Bob,
 
I don’t know about a Crayford style focuser, but Baader makes nice helical focusers for the Vario-Finder.  The one I have is a 1.25” eyepiece holder with helical focuser built into it.
 
Unfortunately I’m not home now and can’t give you the Baader part number.  But it’s NOT the stock one that comes with the Vario-Finder.  As I recall it’s T2 thread at the scope side – so it just threads on.  And unlike another 1.25” adapter for that scope from Baader, this one has a much longer 1.25” throat – so eyepieces or camera nosepieces don’t wobble nearly as much as Baader’s very short 1.25” adapter.
 
Woody
 
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Robert J. Bridges
Sent: Wednesday, October 14, 2020 12:31 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
 
Hi All,
 
 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 
 
Does anyone have a suggestion?
 
Thanks,
Bob
 
--
Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...

Robert Chozick




Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Roland Christen
 

Adding a Crayford focuser will make the system unstable (flex) and defeat the purpose of the finder as a guide scope.

Rolando



-----Original Message-----
From: George <george@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Wed, Oct 14, 2020 4:21 pm
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Bob,
 
As a reminder, the Baader finder uses the locking ring and lens as a fine focuser.
 
Regards,
 
George
 
George Whitney
Astro-Physics, Inc.
Phone:  815-222-6538 (direct line)
Phone:  815-282-1513 (office)
Email:  george@...
 
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Woody Schlom
Sent: Wednesday, October 14, 2020 3:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
 
Bob,
 
I don’t know about a Crayford style focuser, but Baader makes nice helical focusers for the Vario-Finder.  The one I have is a 1.25” eyepiece holder with helical focuser built into it.
 
Unfortunately I’m not home now and can’t give you the Baader part number.  But it’s NOT the stock one that comes with the Vario-Finder.  As I recall it’s T2 thread at the scope side – so it just threads on.  And unlike another 1.25” adapter for that scope from Baader, this one has a much longer 1.25” throat – so eyepieces or camera nosepieces don’t wobble nearly as much as Baader’s very short 1.25” adapter.
 
Woody
 
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Robert J. Bridges
Sent: Wednesday, October 14, 2020 12:31 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
 
Hi All,
 
 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 
 
Does anyone have a suggestion?
 
Thanks,
Bob
 
--
Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...


Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

George
 

Bob,

 

As a reminder, the Baader finder uses the locking ring and lens as a fine focuser.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Woody Schlom
Sent: Wednesday, October 14, 2020 3:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

 

Bob,

 

I don’t know about a Crayford style focuser, but Baader makes nice helical focusers for the Vario-Finder.  The one I have is a 1.25” eyepiece holder with helical focuser built into it.

 

Unfortunately I’m not home now and can’t give you the Baader part number.  But it’s NOT the stock one that comes with the Vario-Finder.  As I recall it’s T2 thread at the scope side – so it just threads on.  And unlike another 1.25” adapter for that scope from Baader, this one has a much longer 1.25” throat – so eyepieces or camera nosepieces don’t wobble nearly as much as Baader’s very short 1.25” adapter.

 

Woody

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Robert J. Bridges
Sent: Wednesday, October 14, 2020 12:31 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

 

Hi All,

 

 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 

 

Does anyone have a suggestion?

 

Thanks,

Bob

 

--

Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...


Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Woody Schlom
 

Bob,

 

I don’t know about a Crayford style focuser, but Baader makes nice helical focusers for the Vario-Finder.  The one I have is a 1.25” eyepiece holder with helical focuser built into it.

 

Unfortunately I’m not home now and can’t give you the Baader part number.  But it’s NOT the stock one that comes with the Vario-Finder.  As I recall it’s T2 thread at the scope side – so it just threads on.  And unlike another 1.25” adapter for that scope from Baader, this one has a much longer 1.25” throat – so eyepieces or camera nosepieces don’t wobble nearly as much as Baader’s very short 1.25” adapter.

 

Woody

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Robert J. Bridges
Sent: Wednesday, October 14, 2020 12:31 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

 

Hi All,

 

 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 

 

Does anyone have a suggestion?

 

Thanks,

Bob

 

--

Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...


Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Robert Chozick
 

I put a ZWO 1.25 helical focuser on mine. It works great. 

Robert 


On Oct 14, 2020, at 2:37 PM, Robert J. Bridges <bob.bridges@...> wrote:


Hi All,

 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 

Does anyone have a suggestion?

Thanks,
Bob

--
Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...


Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Robert J. Bridges
 

Hi All,

 I would like to replace the sliding focuser on my Vario-Finder (10x60;  61x250 f/4.1) scope with a Crayford style focuser. 

Does anyone have a suggestion?

Thanks,
Bob

--
Robert J. Bridges
Professor
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273
Cell: 847-271-7944
bob.bridges@...


Re: Unguided imaging and atmospheric refraction

Allen Ruckle
 

Ray,
What is the non refracted pole?

Using refraction correction while polar aligning?

aruckle

On Sep 20, 2020, at 12:43 PM, Ray Gralak <groups3@gralak.com> wrote:



Clearly this is a complicated issue with no “perfect” answer.
There will always be a variable tracking rate depending on sky position, so the best solution is polar aligning to the non-refracted pole.

This works for both unguided and guided setups, as it minimizes field rotation over a long period during which images are collected.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
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 davidcfinch9 via groups.io
Sent: Sunday, September 20, 2020 12:04 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Unguided imaging and atmospheric refraction

Clearly this is a complicated issue with no “perfect” answer. The difference in refraction rates with varying
atmospheric conditions adds another level of complexity to this discussion. Without fear of “polishing cannonballs,” I
don’t think you can go far wrong by polar aligning using your best method and then by spending the time to develop
accurate modeling for your system. You will still be subject to the whims of our atmosphere. The proof will always be
in your images.

David






Re: Mach2 Unguided imaging results from last night

CurtisC
 

On Tue, Oct 13, 2020 at 01:25 PM, uncarollo2 <chris1011@...> wrote:
However, if you are using APCC Pro (APPM) then just do an automated all-sky model. Doesn't take long.
But you aren't using APPM for this project, are you?


Re: Mach2 Unguided imaging results from last night

Dean Jacobsen
 

That is about what I am doing with my all sky models Ray   - between 45 and 50 - with my short focal length setup and small pixel setup.  Most of my imaging is done at either 530 mm [~1.5 arc sec/pixel]  or at about 380 mm [`2.05 arc sec/pixel].

My images are only 240 sec. max though.

APPM plate solves using SGP and PS2 only take one or two seconds each.  Only occasionally do I run into a long solve and it is a rare occasion that I get a failed solve.  So APPM runs pretty fast on my laptop.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


1600 Worm Damage?

Mike Shade
 

A couple of questions...in PemPro, what would a damaged first generation 1600GTO RA worm look like, in the data?  Is there a way to tell?  What about tracking?

 

If it is suspected that the worm is damaged, is there a solution? 

 

I would really like to replace with the newest "self adjusting" gearboxes, is this possible, regardless of potential damage.

 

Greasing with scope pointed north over mount, some wind and a inattentive helper...not a good day.

 

 

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: Mach2 Unguided imaging results from last night

Bill Long
 

That really depends more on the scope you are using vs the modeling software and encoder system. On a refractor you can get extremely long subs with a very small model. On an SCT you can build very large models if you desire but the nature of those scopes can limit the exposure length on their own.

I personally use an 82 point model for all of my imaging. That seems to work perfectly well for me. The only problem I encounter is the lag in plate solving due to APPM not supporting lighter weight plate solving solutions like ASTAP or PS2.

-Bill  


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Larry Phillips <llp41astro@...>
Sent: Tuesday, October 13, 2020 2:01 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Mach2 Unguided imaging results from last night
 
Rolando, any suggestions on how many data points (in general) should be enough with APPM?

Larry


Re: Mach2 Unguided imaging results from last night

Ray Gralak
 

Rolando, any suggestions on how many data points (in general) should be enough with APPM?
It depends on the equipment you are using, especially repeatability.

With only 42 points last night I was able to get 30-minute unguided images in several different sections of the sky with just a pixel or so trailing with my A-P Traveler and STT-8300.

I'm waiting for a couple adapters from Precise Parts to push the limits since the STT-8300 I recently bought on Astromart has a full set of narrowband filters. My San Jose skies would blow out my unfiltered images in 30 minutes, so that limited the duration that I could test.

-Ray Gralak
Author of PEMPro
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
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 Larry Phillips
Sent: Tuesday, October 13, 2020 2:01 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach2 Unguided imaging results from last night

Rolando, any suggestions on how many data points (in general) should be enough with APPM?

Larry


Re: Mach2 Unguided imaging results from last night

Dean Jacobsen
 

I suspect that the answer would depend on the focal length or pixel scale that you are imaging at.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: Mach2 Unguided imaging results from last night

Roland Christen
 

Ray would be the best to answer that one.

Rolando



-----Original Message-----
From: Larry Phillips <llp41astro@...>
To: main@ap-gto.groups.io
Sent: Tue, Oct 13, 2020 4:01 pm
Subject: Re: [ap-gto] Mach2 Unguided imaging results from last night

Rolando, any suggestions on how many data points (in general) should be enough with APPM?

Larry

9441 - 9460 of 83230