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I have compared a few times my results of PA done with SharpCap and with the 3-points App in NINA - and the results differ always. I do not understand the reason - if my result of PA with SharpCap is 10seconds total and I get 45 seconds with NINA 3-point, I do see any reason for this. Have you experienced a similar outcome? What would you suggest? Normally, I trust SharpCap and stick to that PA.. CS Georg |
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| SharpCap is good but NINA 3-points (or manual drift-rate approach) is better and this is all down to resolution. With the former you are constrained to a large FOV and small FL and therefore larger error due to large image scale, the other two are using native resolution and image scale and thus, potentially, a much better resolution. The same applies using polar scopes and cameras such as iPolar (in fact they are probably worse than SharpCap). |
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andrea tasselli: Thank you Andrea - and yes, I agree - iPolar, which I also have but not in use, is much worse than SharpCap. Interesting thought.... I shall definitely consider it! CS Georg |
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I mainly shoot at 2350 mm f/10 and I seem to get better guiding using NINA for PA. Not sure why though  |
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I personally like the SharpCap PA but it requires disconnecting my camera in NINA and delays cooling. I'd rather cool the camera while doing PA and other things in prep for the night. I have found the three point PA in NINA to be just fine. Keep in mind when guiding having perfect PA is not ideal. Just need good enough |
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I started out using Sharpcap because of the ease of use and speed. Although NINA is a bit slower, I consistently get betting guiding after using NINA. My guess is the PA is better with NINA. There is also the QHY600 camera issue if using both programs. I only use NINA now. Dan |
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I personally like the SharpCap PA but it requires disconnecting my camera in NINA and delays cooling. I'd rather cool the camera while doing PA and other things in prep for the night. I have found the three point PA in NINA to be just fine. Keep in mind when guiding having perfect PA is not ideal. Just need good enough Why is a perfect PA not ideal? Deviations from a perfect PA contribute in my opinion to an increase of FWHM due to increased guiding activities because of DEC errors? |
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Dan Brown: Interesting - what camera issues did you get - I am using both version of the QHY600 and up to now did not recognize issues...? |
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Georg N. Nyman: If your mount is perfect mechanically then it's fine. And maybe the strain wave mounts are better here, but my understanding is having PA out by even 5 arc min is OK because it will help keep guiding moving in one direction in both RA and Dec. I believe this talk from 2019 AIC is where I saw this. https://www.advancedimagingconference.com/articles/2019_Galasso I still try to get pretty close, under 1 arc min, but I don't sweat being exceptionally close. For me, the results are acceptable. Running a 0.63x reduced C8 on an EQ6-R Pro with an OAG. |
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Georg N. Nyman:Dan Brown: See this thread Georg, https://www.astrobin.com/forum/c/equipment-forums/qhyccd-qhy600ph-m/strange-image-issue/ Dan |
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I believe this talk from 2019 AIC is where I saw this. https://www.advancedimagingconference.com/articles/2019_Galasso thanks for that one. Really interesting point that I've never really thought of the idea of leaving some level of misalignment, sort of feels like blasphemy. But, hard to argue with Andy. |
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I use SharpCap for PA . After replacing my finding scope with an OAG , i started using my Omegon 571 camera and 8" newton. Resolution should then be sufficient high enough for more accurate PA. CS Haakon |
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Haakon Rasmussen: Assuming the FOV is large enough to ensure good matches when rotating 180 degrees I would still be weary of possible mirror shifts (which do happen in newtons) that make accurate measurements prone to fail. |
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| Yes mirror shift could be a problem. I have tried to secure my main mirror to that extend, but i have not tested it against any other software. I suppose it would be the same problem with NINA. |
