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Old 02-06-2014, 08:59 AM
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Four Panel Mosaic Vela SNR in NII and OIII

Image here 6MB

http://d1355990.i49.quadrahosting.co...O_4P_N_3k_.jpg

FoV is 6x6 degrees

Bert
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Old 02-06-2014, 09:34 AM
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bkm2304 (Richard Brown)
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Congratulations, Bert. Truly wonderful example of what is obviously a lot of patient work. What are the specs?

Richard
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Old 02-06-2014, 09:35 AM
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Woohoo it's clear

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Wow now that's the sort of thig you were always hoping to be able to do with that little scope, huh? Well done

Mike
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Old 02-06-2014, 11:10 AM
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Wooooh! Massive FOV and amazing view!!!!! One of your best in recent time IMO.
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Old 02-06-2014, 11:16 AM
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That's a great image Bert. Your finest. Love Vela SNR mosaics.

Greg.
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Old 02-06-2014, 12:06 PM
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cazza132 (Troy Casswell)
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Wow! - Very nice! What equipment did you use?
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Old 02-06-2014, 07:47 PM
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batema (Mark)
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That is absolutely stunning. Great job.
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Old 02-06-2014, 08:11 PM
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Gaud thats insane. So very well done Bert
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Old 02-06-2014, 09:06 PM
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Extraordinary detail.... That bright little cirrus like extension on the lower right is beautiful. Wow!
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Old 02-06-2014, 09:16 PM
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Very impressive indeed!

Steve
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Old 02-06-2014, 10:12 PM
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Extraordinary Bert
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Old 03-06-2014, 03:23 PM
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That's insanely awesome Bert, what a wonderful job you have done.
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Old 03-06-2014, 07:40 PM
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wow, that is outstanding Bert - really well done
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Old 04-06-2014, 08:03 AM
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Why isn't this APOD?
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Old 04-06-2014, 08:27 AM
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Thanks for all the nice comments. I have been busy going slowly more mad/insane than ever, trying to master PixInsight. The only way to learn is by trial and error. Be prepared for more errors than you can imagine. The results in the end when you finally win, are worth all the pain.

The image in the original post was stitched together with RegiStar. All previous processing done with PI. Even 3nm NB filters suffer from nasty gradients at the 3.5x3.5 degree field of the RH200. This means it is almost impossible to make seamless mosaics.

I have worked out a protocol with DBE to almost totally eliminate gradients.

This image was made with Gradient Merge Mosaic in PixInsight 14MB

http://d1355990.i49.quadrahosting.co..._4P_NOO_PI.jpg

The lack of seams is obvious.


If you think the above image is stunning I am now working on a Hubble Palette version of the same data plus SII of course that is even better.


Here is panel one at full stacked resolution ie x1.5 sensor size. 15MB

http://d1355990.i49.quadrahosting.co...VSNR_P1_HP.jpg



Hubble Palette is of course SII to red. NII or HA to green and OIII to blue. It is then adjusted using this method

http://bf-astro.com/hubblep.htm

The very dim detail in red and blue is vastly enhanced because human vision is far more sensitive (x20) in the green part of the visible spectrum compared to red or blue.

The simplest way to think of it is that the 'red' data modulates green to give a yellow signal and the blue data modulates green to give a cyan signal.


Bert


Exposure details. Each filter had about 20x16min or 5 hours exposure for each panel. So 4 panels X three filters x five hours = 60 hours of data at F3. To collect equivalent data at the same resultant signal to noise at F5 would take more than 160 hours.
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Last edited by avandonk; 04-06-2014 at 04:28 PM.
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Old 04-06-2014, 09:36 AM
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Regulus (Trevor)
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l usually go to Hubble sites for images like this Bert, They are beautiful-
l really look forward to the next installment with the Hubble palette.
l second the question - Why isn't it APOD?
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Old 04-06-2014, 09:38 AM
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Quote:
Originally Posted by Regulus View Post
l usually go to Hubble sites for images like this Bert, They are beautiful-
l really look forward to the next installment with the Hubble palette.
l second the question - Why isn't it APOD?
I have not submitted it yet?

Bert
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Old 05-06-2014, 09:01 AM
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Nice detail Bert. Colour in the first one is very good. Maybe some more work on the panel joints at the bottom, but a very large project by the looks. I would maybe think increase your overlap for the mosaic and then crop out a segment to allow a seamless mosaic.

Not much noise either. Certainly your best to date.
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Old 05-06-2014, 10:13 AM
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You love that area of sky huh Bert? how many times have you imaged it now? This latest Hubble version panel certainly looks rather good

Mike
who wishes he had an OS RH200
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  #20  
Old 05-06-2014, 01:24 PM
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multiweb (Marc)
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Superb vista. Little noisy but great details. Would look awesome with more data to smooth it all out.
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