Kaliska Posted December 16, 2017 Share Posted December 16, 2017 Ok, so I'm still very green around the ears here, but any idea whats happening here? I'm taking 300sec lights, PHD guided with a GP-CAM on an ST-80, SW80ED on a AZEQ6 GT and getting these double stars...and this is happening on all of them so far. Link to comment Share on other sites More sharing options...
Tim Posted December 16, 2017 Share Posted December 16, 2017 Does your guiding graph show any aggressive corrections? Where in the sky was your target, or what were you shooting? How good is the balance on your mount? Is it windy? Do you perhaps have any trailing cables that might snag or move in the wind? What do short, say 30 second exposures look like? What if you take 20 x 30 seconds and compare the first to the last image? There could be a few reasons for stars like that, are they over the whole image? The answers to these questions might help us diagnose for you Link to comment Share on other sites More sharing options...
bobro Posted December 16, 2017 Share Posted December 16, 2017 I get a similar effect if focus is off. Link to comment Share on other sites More sharing options...
Kaliska Posted December 16, 2017 Author Share Posted December 16, 2017 My guiding graph was like a cross-section of the French Alps and the culprit was a snagged cable from the guide camera. Another thing goes down on my ever increasing check list. Link to comment Share on other sites More sharing options...
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