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Pegasus Astro - Falcon Rotator NOW AVAILABLE

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#1 evansg

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Posted 03 July 2020 - 06:08 AM

Pegasus Astro is pleased to announce the availability of the Falcon Rotator

 

Pegasus Astro – Falcon Rotator is a light-weighted, low profile camera field rotator. Do not be fooled by its thin size! It can lift and handle heavy image trains – dead accurate! Very easy to operate via ASCOM drivers or standalone software will make your life easier to automatically adjust with precision your camera field. Falcon Rotator has been tested at 6Kg / 13.2lbs of imaging setup. 

 

Back Focus 18mm / 0.7”

Rotator Weight 0.7Kg / 1.54 lbs)

Price: $626 (USD)

fr1.png

For more information: https://pegasusastro...falcon-rotator/

https://youtu.be/HySAb4uP58o

 


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#2 Dcox17

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Posted 07 July 2020 - 07:35 AM

Any chance we can get some actual photos? I’d like to see the interfaces

#3 nightfly85

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Posted 19 July 2020 - 03:48 AM

Didn't work with SGP. Worked fine with NINA on the same target M15.

 

The rotater would respond to commands but in the 2nd or third rotate command in the centering action would just "hang" SGP. In the log SGP has entries stating "timed out waiting for rotater move". I will supply more details tomorrow as I been up late testing.

 

Overall these are the things one has to do and the issues I had with the rotater:

 

- couldn't center on target with SGP - SGP would wait indefinitely for the rotater to make a requested move(s) and either it was there already or wouldn't respond the SGP request. I tried multiple times restarting SGP once even in-between.

- worked fine with NINA as far as I could tell.

- initially had issues with PHD2 guiding until I figured out I had to enable it's one and only rotater option "reverse sign for corrections" or something, Sorry don't quite remember the exact wording. But it's the only option on the tab "other devices" that shows up after enabling the rotater in the equipment list.

- don't forget to recal PHD2 with the rotater connected.

 

- two odd issues appeared - and I don't know if they are roater related or not as yet. They both appear in PHD's video frame nearest to the point of rotation in the frames. I use a ASI174 as the guide cam.

    - a circular reflection appears to be coming from the rotater, perhaps off one of the shiny bearings.

          -moving the telescope the reflection stayed mostly consistent (with small moves)

          - rotating the rotater would eventually make the reflection disappear.

         - it wasn't always visible, but did appear numerous times at several angles and positions in the sky.

   - my stars in the PHD video window nearest the point of rotation are always distorted in a elongated pattern.
         - persistent.

 

- you have to have the stand-alone utility running before any ASCOM based connection to the rotater will work. I wish the ASCOM side would auto - launch the standalone utility if not running.

- lastly, the backfocus is actually 19mm without adapters. The camera side threaded attachment piece sticks out 1 mm from the blue body case. I use a 53mm male to 48mm female adapter on the scope side so for me my total backfocus taken up with the rotater is 23mm (19mm+2mm +2mm).

 

More testing and details to follow.

 

I used my own DIY rotater for a few years, but got tired of the slight tilt I could never get rid of - so I am giving the Falcon a try. Its a well built piece of kit and smaller than the pictures make out. It works very quietly and accurately in my minimal testing so far with no slack, slop, or play in the attachment points that I could detect as yet. Much more testing to perform.


Edited by nightfly85, 19 July 2020 - 04:04 AM.

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#4 nightfly85

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Posted 19 July 2020 - 12:53 PM

SGP log file attached.

 

Contains various entries similar to:

 

07/18/20 22:29:08.359][DEBUG][Telescope Thread][CE;] ASCOM Rotator: MoveAbsSync Timeout!  GetPosition reports 342.03, trying to move to 342.00...
[07/18/20 22:29:08.359][DEBUG][Telescope Thread][CE;] Rotate failed...
[07/18/20 22:29:08.360][DEBUG][Telescope Thread][CE;] Auto center failed! Camera rotate failed.

 

or later:

 

07/18/20 22:40:27.410][DEBUG][Telescope Thread][CE;] ASCOM Rotator: MoveAbsSync Timeout!  GetPosition reports 341.87, trying to move to 342.00...
[07/18/20 22:40:27.410][DEBUG][Telescope Thread][CE;] Rotate failed...

 

An image showing the reflection I referred to and the star distortions that are new with the falcon installed - though I am not certain they are falcon related (not present the night before).

 

Cropped Rotater Reflection PHD2

 

Attached Files



#5 evansg

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Posted 21 July 2020 - 01:09 PM

A couple of comments here:

 

  • I do not think that the reflection comes from the bearing.
    This circular reflection probably comes from the OAG which was close to a bright star. I had seen the same reflection pattern in my setup multiple times (without the rotator).
  • Seems there is a minor bug in SGP which is going to be fixed in the upcoming SGP release. NINA and other software that handle the rotator do not have this behaviour.
  • About the elongated stars this might come from the oag also. It depends of the flatness of your field. When you rotate the OAG to different positions the effect might be greater. Sure thing is that the rotator has mechanically zero flex and can support very high loads. There is no way that this rotator can cause that.
  • Standalone utility is required as a server /command concentrator to support multiple clients. This is also required for the future ALT/AZ de-rotation server.

Edited by evansg, 21 July 2020 - 01:12 PM.

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#6 nightfly85

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Posted 21 July 2020 - 06:15 PM

After posting to the SGP forum and communicating with Pegasus Astro - seems like a possible fix for SGP is in the works - just have to wait for it.

 

In regards to reflection and elongated stars with rotater in place:

  • I was using the same setup the night before without either issue appearing and I've never seen either issue with this setup in the many months I've been using it thus the theory.
  • I simply placed the Falcon as close to the SCT adapter on my Edge 9.25 SCT and removed the equivalent amount of spacers/extenders so that my backfocus would remain the same (-23mm) on the scope side of the OAG. So now I have SCT -> SCT adapter -> 53mm Falcon Adapter -> Falcon -> Falcon 53mm adapter -> 48mm spacers -> OAG-> T2 spacers -> FW->Cam
  • I use 2" (48mm" spacers from SCT adapter scope side to my Celestron OAG and then run T2 (42mm) from there to filter wheel/cam. I do this so that the OAG can be placed outside of the cam sensor and I do not get any shadow on the sensor.

I did some more testing on another night - took out my guide cam and repositioned it 90 deg from its original position and then re-focused it. Nothing changed.

 

But the good news is using NINA, I was finally able to capture some lights with the Falcon in place and I see no abnormality that I can attribute to the Falcon. I stacked about 20 - 2 minute Blue frames with no calibrations applied what-so-ever as I thought it would show any and all defects. And I only got the usual dust blobs, dew marks, etc. If I can repeat the test with some Lum lights, that should finalize the issue.

 

Here's a close up of the Falcon on my rig. Note the adapter I'm using (53mm male to 48mm female) on the scope side seems to have a shiny thread portion - that could be it. Luckily the cam side of falcon is complete black so no issues there. But the inner lip of the scope side gives me pause. I can get out my black permenant marker and see if it can fix the issue, starting with the threading.

20200719 182820 (Medium)


#7 Mert

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Posted 22 July 2020 - 10:02 AM

Still have to get out and try mine but it sure looks great!!



#8 nightfly85

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Posted 26 July 2020 - 12:11 AM

SGP issue resolved with version .539




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