CCD Imager Posted December 6, 2016 Share Posted December 6, 2016 Around 8 hours worth of data from Ollys pad. I took my Skywatcher Esprit 150mm, mounted on a 10 micron GM2000 and QSI 683 camera. All images unguided 10 minute subs. Link to comment Share on other sites More sharing options...
michael.h.f.wilkinson Posted December 6, 2016 Share Posted December 6, 2016 Very nice indeed Link to comment Share on other sites More sharing options...
gnomus Posted December 6, 2016 Share Posted December 6, 2016 Nice image. Not 'overdone'. Congratulations. Link to comment Share on other sites More sharing options...
Nova2000 Posted December 6, 2016 Share Posted December 6, 2016 Nice image. That mount seems to track quite well. Great image. Link to comment Share on other sites More sharing options...
Adriano Posted December 6, 2016 Share Posted December 6, 2016 Unguided ten-minute subs?! Wow! Amazing image of M33! Link to comment Share on other sites More sharing options...
simmo39 Posted December 6, 2016 Share Posted December 6, 2016 V nice! Link to comment Share on other sites More sharing options...
DaveS Posted December 6, 2016 Share Posted December 6, 2016 Not overdone at all, the hot blue stars are there but not overpowering and the HII regions are showing up nicely. Not truly "unguided" as the 10-micron mounts guide on their encoders, as do ASA. Link to comment Share on other sites More sharing options...
CCD Imager Posted December 6, 2016 Author Share Posted December 6, 2016 Dave May be pedantic, but no guider was used at all, the mount tracked at high resolution due to the encoders having virtually zero PE Link to comment Share on other sites More sharing options...
DaveS Posted December 6, 2016 Share Posted December 6, 2016 These encoder mounts rely on an accurate sky model so the mount can correct between where it should be and where it actually is. This will vary depending on where it is pointing, hence the large number of points. ASA mounts go further and make a new local model for each imaging run in addition to the overall model. I regulaly see my ASA DDM60 get errors down to 0.1 - 0.2 arcsec. The high resolution encoders (0.03" for my DDM60) mean that wind gusts can be corrected almost instantly. Link to comment Share on other sites More sharing options...
ollypenrice Posted December 6, 2016 Share Posted December 6, 2016 Well it's a very nice result. We talked quite a lot (in a banterish kind of way!!) about processing and CCD Imager's result is true to the processing principles he believes in and which I admire. Nice high black point, no intrusive sharpening or noise reduction, the colour allowed to speak for itself. This is gently done and leaves you feeling that the data maybe has a tiny bit more to give. This is so much better than the feeling that it has had its neck wrung! This looks like M33, not Las Vegas. Olly Link to comment Share on other sites More sharing options...
CCD Imager Posted December 6, 2016 Author Share Posted December 6, 2016 Dave No need to teach me about absolute encoders, I am full convert, couldn't live without them now! The ASA and Astrophysics mounts have Renishaw encoders that are of higher resolution than 10 micron, but as you see from my image, tracking is perfect. I believe there are bigger errors elsewhere than contribute to tracking issues, (sloppy optics, focusers etc). I performed a 60 point model that included compensation for temperature, humidity and atmospheric pressure. Not sure I would want to do a new model for each image, wastes valuable imaging time Link to comment Share on other sites More sharing options...
DaveS Posted December 6, 2016 Share Posted December 6, 2016 Sorry, not really trying to teach you about encoders. The MLPT that ASA mounts do only takes about 5-6 min, all it does is track through your imaging path taking photos (As many as you specify) and solve them on the fly. It then knows the specific corrections to make. I regularly see it get 1.5 ' over 2 hours down to 0.1". You might gather I'm a bit in love with my DDM 60 . Link to comment Share on other sites More sharing options...
CCD Imager Posted December 6, 2016 Author Share Posted December 6, 2016 Dave Ditto re the 10 micron! I'm pleased to see a happy ASA owner as there were some issues when they first started. Link to comment Share on other sites More sharing options...
swag72 Posted December 7, 2016 Share Posted December 7, 2016 Great data shining through that's for sure Link to comment Share on other sites More sharing options...
PatrickGilliland Posted December 7, 2016 Share Posted December 7, 2016 Tidy well process and subtle - nice work. Paddy Link to comment Share on other sites More sharing options...
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