Here's one of my favourite subjects. I did 5 panels on it last night with the C11/Hyperstar combo. Very good seeing but extremely humid from midnight onwards. I hate when everything is dripping but on the upside there was no wind at all.
5min per panel with a Ha 7nm on QHY8. Guided with QHY5 and 8x50mm finder on G11. There is a larger version here [75% - 3MB] and a bigger mosaic here also [50% - 3.3MB] as my computer can't handle massive files.
I've also added a 1:1 crop here [3.5MB]. This is the native resolution: 2.87 asp, field size on this crop is w1.7 x h2.6 degrees. I had to crop because my PC has only 2GB of RAM and PS won't save the original file. Time to get a 64bit system.
Aligned in Registar, stacked in CCDStack and processed in PS CS3.
Thanks for looking.
Last edited by multiweb; 19-03-2010 at 09:14 AM.
Reason: updated links & fiedl size
Wow plenty of detail in this, the hyperstar works great. I would have thought the short 22" focal length with a QHY8 would have covered most of this area without needing a mosaic, Eta must be bigger than I thought.
Clear skies Ken.
The mosaic is great.
The smaller image has more outer detail but lacks contrast in the inner part of the image. Perhaps you can achieve a better compromise on those 2 aspects. Shadows/highlights will give better contrast in the homonoculous (spelling?) without losing detail and brightness in the outer bands.
Top shot Marc (ps: can I have some colour I like Eta with colour)
Cheers
Thanks Trev - Maybe narrowband if I'm courageous
Quote:
Originally Posted by mill
The mosaic shows a load better detail than the image here
Stupid jpg
Thanks Martin. Yeah something screwed up on the thumbnail. Will have to repost that bit. Looks muted
Quote:
Originally Posted by DavidU
Oh yes ! Sensational mosaic Mark
Thanks David.
Quote:
Originally Posted by desler
Wow Mark, the mosaic is something quite special.
Well done indeed, I also can't wait for the colour to be added.
Darren
Thanks Darren - color?.... that could take a while
Quote:
Originally Posted by Octane
Marc,
That mosaic is stunning!
Hopefully you can get the chance to grab the requisite other panels and comlpete the mosaic.
I would dearly love to see NGC 3352 as part of this composition, too.
Well done, mate.
H
Thanks H! Yeah only four panels to go.
Quote:
Originally Posted by CoolhandJo
Lovely to view. Very nice in every respect.
Thanks Paul.
Quote:
Originally Posted by zipdrive
wow! Great Mosaic awsome!!!
Thanks David. Glad you liked the mosaic.
Quote:
Originally Posted by Ken
Wow plenty of detail in this, the hyperstar works great. I would have thought the short 22" focal length with a QHY8 would have covered most of this area without needing a mosaic, Eta must be bigger than I thought.
Clear skies Ken.
Thanks Ken. On the C11 the field is actually not much bigger than my 5" newt at F/5. I think you get much wider fields on C6/C8s.
Quote:
Originally Posted by jjjnettie
Bootiful!!
No woories!
Quote:
Originally Posted by Ric
Top stuff Marc.
The mosaic is fantastic.
Thanks Ric.
Quote:
Originally Posted by gregbradley
The mosaic is great.
The smaller image has more outer detail but lacks contrast in the inner part of the image. Perhaps you can achieve a better compromise on those 2 aspects. Shadows/highlights will give better contrast in the homonoculous (spelling?) without losing detail and brightness in the outer bands.
Greg.
Thanks Greg. Yes the thumbnail is muted and the dynamic range has gone out of the window... The cropping definitely did something. Will repost the smaller version. The mosaic looks sharper.
Quote:
Originally Posted by strongmanmike
Err?..Greg, I think he was actually a Greek astronomer
Fantastic mozaic Marc
NOW you are starting to extract the FASTAR edge
Mike
Thanks Mike. Yeah I'm getting there now. Consistent focus is my next big challenge then I can go back to drinking wine.
I had a tweak, the background was a bit high (on the hi res version). Small level tweak, but seemed to make a big diff. I know ppl sometimes like to have the background high, but in a busy pic, it can wash out detail and flatten the overall effect. There is no detail in the histogram from black to data start, so a high background level only adds a cast that doesnt(IMO) work in this case.
I had a tweak, the background was a bit high (on the hi res version). Small level tweak, but seemed to make a big diff. I know ppl sometimes like to have the background high, but in a busy pic, it can wash out detail and flatten the overall effect. There is no detail in the histogram from black to data start, so a high background level only adds a cast that doesnt(IMO) work in this case.
Yeah I know what you're saying. I know what's happening now. If you check here and look at the overall picture you'll see the sky gets very dark as you get away from the nebulosity but the overall intensity around the center is still pretty high because of all the whispy stuff but for the dark nebulae. So by cropping in the light areas everything looks bright as a result. I guess the histogram should be tweaked differently for close ups.
that could take a while 
