I encountered this. It appears to trace wide arcs and then the pointer jumped 180°. I thought it was cone error preventing me from pointing at NPC, but I recalibrated that and I wasn't that far off.
Using EQMod Driver with Skywatcher HEQ5
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
Waveshare Stepper Motor Board - DIY Focuser
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
Well, I should have known that slewing uncalibrated mount near the pole might end up in odd discontinuities like this. I will try to test it tonight and see if I can figure out a way to do it properly and safely. If not, I'll disable the auto slew and just advise the user to move the mount closer themselves.
Hi Jasem, first the align model is working very well, I have checked that with PHD2 drift align and I am really closer than I was before.
Also I can make longer exposures without drift. I was guiding with 0.5" (both RA and DEC) and now I am on 0.4" (RA)/0.2"(DEC) so I it's really a big improvement.
The issue is only the first positioning of the mount, If made manually there's no problem. Thank you for this method, it really helps.
(PT) SC@ROS Observatory
TS 6" F4 Newt / Nikon D5500 / GPU CC / Datyson T7M / Arduino Moonlite DC Clone- HEQ5 Pro
Orion 120ST / Explore Scientific 80APO / TSAPO102Q Sextuplet / G2-8300FW5 / ES FF 2" / ASI120MM - Arduino Moonlite DC Clone - Vixen GPD2 www.flickr.com/photos/139335144@N03/
I tested the alignment method yesterday. Just a simple remark. When a slowing orientation (west or east) is chosen at first rotation it remained not set at second rotation.
Anyway I didn't had enough time to test the accuracy as the clouds went to ruin the rest of the night.
I still have this strange issue with what appears to be a meridian flip while doing alignment.
Before I did the alignment I slew the mount to EAST a bit more than 90 deg° in RA to be sure to have enough space to do two 15° slews to WEST without meridian flip.
I recorded a session with two alignments, the first worked, it did the 15° deg. west rotations without going to the other side.
The second (to prove the accuracy) was far off and it did? a meridian flip although I started at roughly the same RA as in the first alignment... Maybe I am to stupid and should read "Telescope for dummies" again, especially section meridian flip
If someone finds a reason why the second alignment did slew to the other side and why the result is so far off from the first one please let me know
Also, I noticed from the video when you recheck, you manually go back to the beginning and start again. No need. just start again from where you are, but reverse the direction (i.e. east instead of West), and you're set!