paul Posted February 3, 2021 Share Posted February 3, 2021 Out of two hours manage 90 minutes due to clouds (3min subs @ISO800) with my 550d on M1 but I seem to have my optics out of skew the stars have an aura and coma. ? Certainly not worth spending more time on processing. I suspect the newt is off square or the clip-in filter has an issue. Its a scope I fiddled with a lot over the summer so its probably something I've done. Time to tear it down and build it up from scratch double checking its all square- as I know it has done much better. (My modded Orion Optics 250mm with Skywatcher 2-element coma corrector.) 3 Quote Link to comment Share on other sites More sharing options...
KevS Posted February 5, 2021 Share Posted February 5, 2021 The abberation appears to be all going the same way Paul, (The refraction spikes are suppressed at 2-o-clock) may be as simple as just a serious re-collimate. Try rotating the camera 180 degrees and see if the problems remain on the same plane before you go too mad tearing the scope down. Quote Link to comment Share on other sites More sharing options...
Jkulin Posted February 5, 2021 Share Posted February 5, 2021 Yep what Kev said, I also think you have clipped the sky try and dial it back a bit Quote Link to comment Share on other sites More sharing options...
MarkAR Posted February 6, 2021 Share Posted February 6, 2021 A good attempt but as Kev says, collimation looks off. Quote Link to comment Share on other sites More sharing options...
Gina Posted February 6, 2021 Share Posted February 6, 2021 Yes,definitely a good attempt. It's a difficult one. It's small. Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted February 6, 2021 Share Posted February 6, 2021 Still got some nice detail. Quote Link to comment Share on other sites More sharing options...
Gina Posted February 6, 2021 Share Posted February 6, 2021 Yes indeed! Quote Link to comment Share on other sites More sharing options...
paul Posted February 7, 2021 Author Share Posted February 7, 2021 I checked the scope out, it definitely was out of collimation - laser spot was on the ring. I skipped my normal checks in my haste (clear skies calling !!) - lesson learned! I'm surprised at the magnitude of error though. @KevSThat was a good call on the spike offset - I shall use that test. Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted February 7, 2021 Share Posted February 7, 2021 Easy quick check is well out of focus stars - if the shadow of the secondary is not central, a quick tweak might save your session until you have time to do a proper collimation. 1 Quote Link to comment Share on other sites More sharing options...
KevS Posted February 7, 2021 Share Posted February 7, 2021 4 hours ago, Stub Mandrel said: Easy quick check is well out of focus stars - if the shadow of the secondary is not central, a quick tweak might save your session until you have time to do a proper collimation. +1 for the above. Quote Link to comment Share on other sites More sharing options...
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