bottletopburly Posted April 3, 2022 Share Posted April 3, 2022 M13 , 3.9 hrs 120 sec exposure zwo533mc, stacked in Astap processing in Startools 8, there is a reflection on the bright star not too sure where from anyone know of a possible cause let me know. Dave 5 Link to comment Share on other sites More sharing options...
bottletopburly Posted April 4, 2022 Author Share Posted April 4, 2022 @alacant steve any idea what may be causing the reflection on the bright star ? Link to comment Share on other sites More sharing options...
alacant Posted April 4, 2022 Share Posted April 4, 2022 3 hours ago, bottletopburly said: any idea Hi Guessing sw pds... Is it on all the individual frames? Are the mirror clips still in place? Are the tube, focuser internals, secondary mirror edges and spider blackened? Visually looking down the tube with a torch, anything reflective/dirty? As it's to one edge, my first guess is focuser intrusion. Link to comment Share on other sites More sharing options...
bottletopburly Posted April 4, 2022 Author Share Posted April 4, 2022 1 hour ago, alacant said: Hi Guessing sw pds... Is it on all the individual frames? Are the mirror clips still in place? Are the tube, focuser internals, secondary mirror edges and spider blackened? Visually looking down the tube with a torch, anything reflective/dirty? As it's to one edge, my first guess is focuser intrusion. 200pds , flocked tube ,apeture mask snug fit and returns slightly down side and covers clips so confident that’s not issue but will shower cap ota end to make sure , baader steeltack fitted I think there is a possibility of light leak where drawtube goes through verabase , I will double check there’s no shiny nuts in ota , I don’t think there is and secondary edge blackened , spider not blackened by me only stock black , will check individual frames . Link to comment Share on other sites More sharing options...
alacant Posted April 4, 2022 Share Posted April 4, 2022 20 minutes ago, bottletopburly said: apeture mask Any irregularity? Best remove both it and the mirror clips. Link to comment Share on other sites More sharing options...
bottletopburly Posted April 4, 2022 Author Share Posted April 4, 2022 1 hour ago, alacant said: Any irregularity? Best remove both it and the mirror clips. The aperture mask is 3D printed and covers the clips I will look into it and see if there’s anything obvious cheers steve . Link to comment Share on other sites More sharing options...
bottletopburly Posted April 5, 2022 Author Share Posted April 5, 2022 @alacant just checked four possible culprits, focuser light leak , two screws thread where black paint has come off , spider vane holder screws, light from primary don’t think this is the issue but will cover , focuser and screws are the primary candidates. dave 1 Link to comment Share on other sites More sharing options...
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