Guest whizzbang Posted March 19, 2016 Share Posted March 19, 2016 3 hours of Baader Ha, in 900s subs, Atik 383 mono and a Borg 89 Link to comment Share on other sites More sharing options...
Tweedledee Posted March 19, 2016 Share Posted March 19, 2016 Very nice wide view Link to comment Share on other sites More sharing options...
Guest whizzbang Posted March 19, 2016 Share Posted March 19, 2016 2 minutes ago, Tweedledee said: Very nice wide view thanks, I do like the FOV that the atik and the borg give..... Link to comment Share on other sites More sharing options...
Tweedledee Posted March 19, 2016 Share Posted March 19, 2016 (edited) Is the F4.3 Borg? That is short Edited March 19, 2016 by Tweedledee Link to comment Share on other sites More sharing options...
+Graham Posted March 19, 2016 Share Posted March 19, 2016 (edited) I like that Just a thought but looking at the off set Airy discs around the stars I would say you have slightly pinched optics on your Borg.. Need to get Phil to venture an opinion Refactors are his field of expertise. Edited March 19, 2016 by Graham Link to comment Share on other sites More sharing options...
Sheila Posted March 19, 2016 Share Posted March 19, 2016 nice Link to comment Share on other sites More sharing options...
Guest whizzbang Posted March 19, 2016 Share Posted March 19, 2016 7 hours ago, Graham said: I like that Just a thought but looking at the off set Airy discs around the stars I would say you have slightly pinched optics on your Borg.. Need to get Phil to venture an opinion Refactors are his field of expertise. Thats interesting, i though that misshaped stars would have resulted from pinched optics, true the disk isnt perfect around the brightest stars, so i thought that it was a missalignment of either the filters of ccd window to the optical axis...... Link to comment Share on other sites More sharing options...
+Ibbo Posted March 19, 2016 Share Posted March 19, 2016 I think its the filters that casue a lot of the halos round the brighter stars i will dig ont the classic pinched optics image later this weekend Link to comment Share on other sites More sharing options...
+Graham Posted March 19, 2016 Share Posted March 19, 2016 It might well be the filters but the offset of the airy discs are on different sides on the stars on the left and right of the image. Link to comment Share on other sites More sharing options...
Guest whizzbang Posted March 19, 2016 Share Posted March 19, 2016 And I guess being close to the CCD chip we are probably talking a sub mm alignment issue.....they are 36mm unmounted, so any slight difference in the tightness of the three retaining screws would be enough Link to comment Share on other sites More sharing options...
+Graham Posted March 20, 2016 Share Posted March 20, 2016 21 hours ago, whizzbang said: And I guess being close to the CCD chip we are probably talking a sub mm alignment issue.....they are 36mm unmounted, so any slight difference in the tightness of the three retaining screws would be enough You have probably just answered the question. If the screws are too tight they might cause the filter to flex introducing a curve which would explain the Airy discs offset being on different sides of the stars. Sub mm -- microns more like. Its still a great image Link to comment Share on other sites More sharing options...
Stephen Posted March 21, 2016 Share Posted March 21, 2016 Nice image Russell Link to comment Share on other sites More sharing options...
Guest whizzbang Posted March 21, 2016 Share Posted March 21, 2016 many thanks all for the encouragement, its been a difficult imaging season, what with weather and kit playing up.... Link to comment Share on other sites More sharing options...
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