Hello, we have carefully checked your log. Based on experience, we have the following suggestions:
1 Check whether the clutch of Mount DEC is normal
2 Check whether the rigidity of the guide scope, the guide camera, and each connecting part is normal? Is there a slight shake when under force?
3 It is recommended to set RA/DEC duration to 1000 1000 first, adjust RA/DEC Aggr to 50%, and then gradually adjust according to the guide curve after starting the guide.
Weird Goings on...
PMTeam@ZWO
Hi, but this does not address the fact that the stars are perfectly round. I have previously checked the mechanics of the mount and guide scope and everything is very good. I really think this is an asiair issue..
thanks Nick
SFn8CieR Hi Nick, could you please send us the FITS files from the time period in question? This will help us better understand and address the problem. Thanks!
PMTeam@ZWO
When I try to upload the fits file it will not upload.
I think the file is too big, taken with a full frame camera. 46.8Mb
Is there another way to do this?
thanks Nick
SFn8CieR Hi Nick, you can send the file to the email address luffy.liu@zwoptical.com. I will forward it to the development team for analysis. Thank you.
PMTeam@ZWO
I have tried to email but the file is too big. I dont have dropbox or cloud or anything like that. Will a jpg version of the file be adequate? I tried to upload it but its too big as well.
thx Nick
Corsair
I will email it to you. It is a jpg file but you can see that the stars are round. Time of photo is 21.35 on 20240803 which matches the glitches in my phd log graph and shows that the 5 min exposure the stars are round and do not show signs of the DEC glitches. I think it is the asiair that is displaying the incorrect information. I also have noticed over many nights now that the guiding is initially quite good at around 0.6, 0.7 rms and after a while it gets worse going up to 2 rms, but when I clear the guiding graph and watch the numbers, it stays at around 0.6, 0.7 again for a while then creeps up again, and so I clear the graph again and so on. There must be a cumulative error in the aisiair for the ioptron mounts, as I have read that others are having the same issues. Please advise.
many thanks again
Nick
SFn8CieR Hi Nick, thanks for sending the JPG image. Could you let us know if this is a single frame or a stacked image? Many thanks again!
PMTeam@ZWO
This is a single exposure. cheers Nick
4 days later
PMTeam@ZWO
Is there any progress here, I have no response, thanks Nick
We tested it with the tool and found that the average roundness of the star points in a single frame is not so perfect. It is consistent with the guide star scatter diagram of that night.
PMTeam@ZWO
OK so how did you figure that out from that data? If you zoom in to the stars they are round even at high magnification, so that does not make any sense.
Thanks.
PMTeam@ZWO
I opened the same image I sent you in Siril and chose the same star as you and got different results. Firstly, how can this be? Secondly, how can you tell from that data that the star is not round? If you zoom in to that star it is perfectly round even at high magnification. Again I cannot upload my screenshot to show you my siril pic. It is only 2.3Mb so it should be good but something is preventing me from uploading anything so please take a look at my settings to see if something is wrong. Also i will email you my screenshot so you can see its the same star but different values. let me know how you go.
many thanks again
Nick
PMTeam@ZWO
So why no response from you?
a month later
PMTeam@ZWO
Please show me how this is consistent, as you say.