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Hello,Let's see if someone has experienced the same thing.
So that indicates to me that the tracking was far from perfect...
I have attached several photos and a video of the PHD2 logs (ASIair) showing the movement of the image center during the session, and the PHD2 log.Other relevant equipment information, in case it's useful for the case:
The only odd thing tha i've seen in the log of PHD is that:Pixel scale = unspecified, Binning = 1, Focal length = unspecified Video Blink - Nebulae moving during the night : WhatsApp Video 2023-09-28 at 16.27.56.mp4 Perfect guiding it seems....     Log of the guiding: PHD2_GuideLog_2023-09-26_215025.txt |
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Hi Francisco, That is good guiding indeed - but I suspect you are correct - it looks too good, particularly for a telescope as large as a C8. I think the clue is the reference by PHD to pixel scale and focal length ... I'm not certain whether you are using an OAG or a separate guide scope ? If using an OAG, be sure to set Focal Length to 1270 in the guide camera settings - otherwise the focal length of your guide scope, and the pixel size of your guide camera - which will be different to that of your main imaging camera. I suspect that these might not have been specified correctly during setup - meaning that the guide accuracy is not being calculated correctly. I hope that helps  |
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| I would be interested in seeing some subs. |
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Tommy Mastro: Thank you very much Tommy... this is the link of the 72 subs of this night... the subs are not too large just because the pixel size of my camera is too little for the resolution of my telescope C8 so i'm shooting in Binnig 3x3... Link: https://drive.google.com/drive/folders/1mL_4ZCYfPYj5BZ8KqNo4eww95zMJELcB?usp=sharing Tell me if you have any problem to download it... |
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Gary JONES: Thanks a lot Gary !!! I need more nights to keep testing, but it coincides with the night I installed the patched and validated operating system for the ASI Air Pro by both ZWO and Skywatcher, in order to connect the EQ6-R Pro through the USB port with ASIair. I've been using it for 3 years, the ASI air and guiding system, and the configuration of the guiding camera hasn't changed much, if at all, with the typical 120mm ZWO guide scope that's quite common. I also opened a question on the ASI air forums to see if there might be an issue with the patched operating system version, but I doubt I'm the first one to encounter this. It would be unfortunate for me to start using the EQ6 and, while adapting to it, encounter an issue connected to ASI Air. Thank a lot !!!! |
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You're very welcome One thing for sure - addressing the issue with unspecified pixel scale and focal length with certainly help Gary |
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Gary JONES: In the end, all the people who recommended that I switch to an OAG (Off-Axis Guider) system were right. It was a flexure problem between the guide scope and the main scope, exacerbated by the 1,200 mm focal length, and it was resolved with an OAG! Many, many thanks!!! |
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without pixel size and focal length, PHD will have no clue. That's pretty well evidenced by the fact your pixel error is the same as your arc second error. Also, you said PHD indicates 'unspecified'. With an ASI120mm at 1270mm, your image scale should be 0.61" You need to put those numbers in somehow. Beyond that, I'm not an ASIAIR user, so you're on your own there. I suspect theres nothing wrong with your mount, nor the connection to it. |
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Hi Francisco, Ah - if you were using a guide scope that is a completely different scenario. I'm sure you'll find an OAG much better, particularly with a long focal length. But Brian is absolutely right - you must enter the correct numbers into PHD, otherwise your guiding charts will be completely wrong - and your guiding will suffer. Follow the PHD setup wizard - and make sure you enter the FL of your main scope in the PHD settings for focal length. |
