I’m having a bit of trouble getting SGP to play fully nicely with my Optec Gemini Focusing Rotator, though the basics seem to be sound and I think I may be one misconfiguration or misunderstanding away from happiness. My setup on the hardware side is:
- EdgeHD 1400, running at f/11
- Paramount MX+
- Optec Gemini Focusing Rotator
- STL-11000M, using internal guider
Software-wise I’m using:
- SGP version 22.214.171.124
- PHD2 2.6.4
- Windows 10 Fall Creators Update
I notice that @johnnyK and @chasmiller46 are using the Gemini as well, and have worked through some issues that sounded similar to what I’m seeing, but I’m either facing something slightly different, or I’m not faithfully following what was discussed in the following related thread (Optec Gemini Focuser & Rotator).
What is working for me:
- I can connect the Focuser and Rotator parts of an SGP equipment profile to the Gemini.
- The Gemini powers up and can move focuser and rotator without difficulty.
- SGP autofocus works perfectly.
- SGP can make the rotator turn, though not necessarily where I want it to go, or where SGP wants it to go when doing a plate-solve driven precise centering operation.
The problem I’m having is that I can’t get seem to get SGP to establish the proper offset between the hardware angle reported by the Gemini (the value that I believe ends up in the POSANGLE FITS header) and the plate solved East-of-North position angle (which ends up in the ANGLE FITS header).
The inability to get these values synchronized means things like plate solve driven centering and the like never work because SGP ends up sending the rotator on crazy excursions that never manage to get the camera oriented the way it’s supposed to.
What I’ve been trying is the following:
- Power up and connect all the gear
- Home the rotator by pressing the ‘Zero’ button in the ‘Rotator’ dockable module
- After the rotator finishes going home (typically pressing ‘Zero’ sends it to a reported angle of 360.0), I take an image using ‘Frame and Focus’ and then right click to plate solve the image using Plate Solve 2. I see the RA and DEC image center and the solved position angle in the Plate Solve 2 UI after the solve completes successfully.
It was my possibly wrong understanding that doing the above would be sufficient to get SGP rationalized in a way that the angles it would report for the rotator in the UI, and any user or SGP chosen positions requested of the Gemini would henceforth all be expressed in sky position angles and things would work happily thereafter, but this doesn’t seem to be the case.
Can anyone point to me to what I may be doing wrong with either:
- Any configuration I’m likely to have forgotten, or got wrong, in either SGP or any Gemini-specific configurable state?
- Any ritualized steps I need to do at the start of a session, after powering up the gear, to get SGP’s understanding of the rotator into a good state?
Thanks in advance for any pointers…