Hi.
had a couple of hours of very good seeing and just had to revisit M16 in Ha. I like the appearance in Ha and this level of detail is rarely available at shorter wavelengths, so will probably stay monochrome. This data was undersampled, so tried out the new drizzle in Pixinsight - it works well.
Thanks for looking. Regards ray
Oh yeah! The drizzle tool works great, although it really put quite a load on my pc. It took almost an hour to get through BBP (I was calibrating with new flats, that wouldn't have help with duration)
Wonderful detail Ray, it's very impressive!
Yes the drizzle algorithm is great, I've played with it on some data I'm currently collecting and it looks very promising.
Oh yeah! The drizzle tool works great, although it really put quite a load on my pc. It took almost an hour to get through BBP (I was calibrating with new flats, that wouldn't have help with duration)
Thanks Rod. I selected an ROI and it crunched through 35 subs in no time - very impressed.
Quote:
Originally Posted by Andy01
ooooohhh, nice
thanks Andy
Quote:
Originally Posted by gregbradley
That is remarkable resolution for an 8 inch scope. Stunning.
Greg.
Hi Greg. This is with a 250 f4 Skywatcher - I retired the 200 GSO and now have the luxury of a CF scope - which is a major plus at f4. At this site, I have always been seeing limited, even with the old 200mm scope - an 8 inch scope will resolve just as well as a 20 inch under these conditions. I have the sampling at 0.9 arc sec, but have occasionally had seeing below 2 arcsec - ie it's undersampled. Drizzle looks like being a great way to take advantage of this (very welcome) problem.
Quote:
Originally Posted by SkyViking
Wonderful detail Ray, it's very impressive!
Yes the drizzle algorithm is great, I've played with it on some data I'm currently collecting and it looks very promising.
Thanks Rolf. Drizzle was fairly painless in PI, but in combination with deconvolution, generated some messy artefacts on the brightest stars - left them in for info, but it is only a cosmetic issue that will probably be fairly easy to fix with careful masking.
Fantastic detail, Ray! I would have expected more noise using drizzle with 3 hours of subs but I guess it is a bright object.
Cheers,
Rick.
Hi Rick. I was also surprised at how little noise there was - other drizzle implementations can be really ropey.
Looks like they added drizzle code to run in parallel to the already excellent standard stacking, with links across to take advantage of the proven normalisation etc. Smart approach and it works very well at controlling noise. Had to do a little bit of noise reduction in the darker parts of the image, but not a lot.
The part of that page where they show a false colour image of the nebula and say that it is "visible" is a little deceptive in my opinion. I guess they are in the visible spectrum.
Great image there though!
...Bustardo! 
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, but seeing does what it wants and I reckon we just have to be grateful for whatever the atmosphere provides 
That's insane.
