Hello all...
First (very quick) attempt at Synthetic RGB imaging on 2 of the most OIII-free objects up there...Cat's Paw and Lobster nebulae!!!!
40D modded, 300mm f4L lens
Astronomik EOS Clip-In Ha and OIII filters
Ha: 8x10mins
OIII: 12x10mins
Processing:
1.Split both Ha and OIII images into component RGB channels.
2.Used Ha(red) channel, OIII(green) and OIII(blue) channels.
3.Merged above files into a new RGB image.
4.Tweaked in PS CS4
Will try more sophisticated methods soon hopefully.
Did you notice Doug that with the method you used at least the stars are white! What you should do next is try to get a normal full spectrum colour image to get the star colours.
Looks a lot better Doug. At least the stars don't have that pukey aqua halo we both have suffered from in the past with the Ha RGB blends.
Still work to be done but at least you seem to be on the right track.
Still waiting for my OIII and SII filters to arrive, some clear skies and then just the will to go out and get back into it again.
Did you notice Doug that with the method you used at least the stars are white! What you should do next is try to get a normal full spectrum colour image to get the star colours.
looks very good to me.
bert
Agreed Bert (not the "looks good..."part, but the "...stars are white" bit!!!) - now a question!
Would that mean a short set of RGBs would be needed to capture star colours only - or is another 18x10mins job!!!!????
Quote:
Originally Posted by Hagar
Looks a lot better Doug. At least the stars don't have that pukey aqua halo we both have suffered from in the past with the Ha RGB blends.
Still work to be done but at least you seem to be on the right track.
Still waiting for my OIII and SII filters to arrive, some clear skies and then just the will to go out and get back into it again.
Well done Doug.
Thanks Doug - yeah, those HaRGB star colours are as you say...pukey!!
I considered the SII filter, but really I think I would be wasting my time using it on a DSLR. Jeez, OIII is pushing the envelope as it is!!!
Quote:
Originally Posted by DavidU
Jeez that was a quick learn Doug ! It came out great. I also like Bert suggestion
Beginners Luck David !!!
Quote:
Originally Posted by cookie8
That's awesome Doug.The 2 objects fit in nicely. Top drawer stuff.
Too kind Vincent - this really is a very rough first go, but I'm happy it wasn't a complete disaster!! Cheers - how's that EQ5 going? Any more images coming our way soon??
Doug
Great piccie Doug...and there's a semi load of detail still in that piccie waiting to be pulled out
Thanks Carl - looking forward to trying this method out on some other objects now.
Quote:
Originally Posted by avandonk
...No you only need enough exposure to get just the stars. Obviously you would only use a LPR filter.
Bert
Cheers Bert - 1-2 week wait for my new Hutech LPS2 to arrive, so I may go crazy on the OIII data first. Got some M8/M20 and M17 Ha data to work with... fun fun fun!!!!!!!
Not bad at all Doug, now im just waiting to get some clear skies and no moon... :S winter time is so harsh for a astro junkie Im looking to have a good crack at the Swan Neb M17 on the 20th of this month. that is if the newly modded 40d gets back from its open heart operation in time gastly ERORR 99.....
off topic bert, with the star colours the only stars i generaly get colours out of are the really bright ones which figures. so taking a really short exp to capture the stars will bring out this colouring? then stack in something like DSS?
Cheers Andrew - 300mm FL is a sweet spot for 1.6x crop sensor DSLRs I reckon!? (and full frame too - oops sorry Bert!!)
Still unsure of this method v's one shot colour - is it worth it!?
I'll have to do a RGB v's Synthetic RGB comparison to get to the answer!!
More work!!! Jeez I need early retirement to fulfill my extra-curricular commitments!!!
...Cat's Paw and Lobster nebulae!!!!
Im looking to have a good crack at the Swan Neb M17 on the 20th of this month. that is if the newly modded 40d gets back from its open heart operation in time gastly ERORR 99..... 
