Astroscot2 Posted December 12, 2016 Share Posted December 12, 2016 Its been an age since I last posted an image on the forum, Ive been sorting out number of mechanical issues with my OO CT10 for what seems like years. Ive come to a point where I Just want to get some images. This Image was taken over 3 nights in Nov, 36 x 10 mins thought the CT10 and ASA corrector F5.6 1410 mm, SXVH694 and Baader Ha filter Sat on top of the Mesu. I had a nightmare sorting our my flats , Lights-Bias / flats -bias seem to do the trick. I lost around 2 hours of subs due to heavy frost. Will add OIII possibly next year . Mark mel15flic.tif Link to comment Share on other sites More sharing options...
ChrisLX200 Posted December 12, 2016 Share Posted December 12, 2016 Looks good, nicely detailed. ChrisH Link to comment Share on other sites More sharing options...
spaceman_spiff Posted December 12, 2016 Share Posted December 12, 2016 Very nice image. Interesting dash diffraction patterns. Dan. Link to comment Share on other sites More sharing options...
JeremyS Posted December 12, 2016 Share Posted December 12, 2016 Wonderful image Jeremy Link to comment Share on other sites More sharing options...
PatrickGilliland Posted December 12, 2016 Share Posted December 12, 2016 Looks very nice so far - look forward to the next channel. Paddy Link to comment Share on other sites More sharing options...
wimvb Posted December 12, 2016 Share Posted December 12, 2016 Stunning! My guess is that the dashed diffraction spikes are due to the NB. Combined with other colours they will probably add up to rainbow spikes, showing the full diffracted spectrum. In other words, only where the diffraction of 655 nm results in constructive interference will the spike be bright. Where the diffraction results in destructive interference the spike will be dark. As I said, just a guess. Link to comment Share on other sites More sharing options...
Astroscot2 Posted December 13, 2016 Author Share Posted December 13, 2016 Many thanks for the comments - My Newtonian has a very thin double vein spider, I wonder if this produces the dashed diff spikes ? Link to comment Share on other sites More sharing options...
CraigT82 Posted December 13, 2016 Share Posted December 13, 2016 I learned this myself the other day! The striped spikes are indeed due to constructive/destructive interference of the narrow band light. White light has too broad a range of wavelengths to produce the effect, the stripes are 'smudged' out Link to comment Share on other sites More sharing options...
alan4908 Posted December 13, 2016 Share Posted December 13, 2016 Very impressive detail and I do like the 3D effect. Alan Link to comment Share on other sites More sharing options...
pietervdv Posted December 13, 2016 Share Posted December 13, 2016 Very nice image! What kind of corrector did you use? Was the double vaned spider a change you did yourself? The diffraction spikes look very delicate. I like that a lot. I can see some very small flaring in your bright stars. You can see traces of the main mirror Clips or possibly a turned down edge of the main mirror. Adding a baffle in front of the main mirror would thighten you stars even further. Regards, Pieter Link to comment Share on other sites More sharing options...
Astroscot2 Posted December 14, 2016 Author Share Posted December 14, 2016 Hello Pieter, Thank you for your comments, The corrector is the ASA Quattro, unfortunately this amplifies the Fl to F5.6 but I can live with that, the double spider was upgraded as the original was twisted and I was never happy with any adjustments I made to it, TS provided the new spider. I still have some tweeking to do on the scope, spider is still slightly askew and as you say a mask for the mirror clips will improve the stars. A dew/frost shield is also on my list as you can see from the image below ;-) thanks Mark Link to comment Share on other sites More sharing options...
Barry-Wilson Posted December 15, 2016 Share Posted December 15, 2016 Very accomplished and smooth Mel15 - will be a cracker when complete. Link to comment Share on other sites More sharing options...
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