NGC 2070 - Tarantula in Narrowband

rat156 · #1 03-12-2009, 08:56 PM

Hi All,

Got some data last night for this target.

100 minutes through two different Ha filters (60 minutes 4.5nm, 40 minutes 13nm), and 60 minutes through a 13nm OIII filter.

Inspired by Bert's treatment of similar data I tried to combine the data as he did, HaOIIIOIII mapped to RGB. I also made a synthetic green channel for comparison, so that makes HasGOIII mapped to the RGB channels.

Cheers
Stuart

P.S. Just added some more Ha data. I love processing this stuff, you can do all the "wrong" things to bring out detail. In the last two I've really boosted the blue contribution to highlight the areas of OIII emission.

Bassnut (Fred) · #2 03-12-2009, 09:23 PM

Nice clean 3d effect Stuart, and not too many pesky stars to mess it up

.

Interesting you mixed 4.5 and 13nm Ha, whys that?.

rat156 · #3 03-12-2009, 10:24 PM

Just experimenting Fred.

desler · #4 03-12-2009, 10:43 PM

Wow Stuart, I like it, Almost a face like structure in the top right of the Neb, A little freaky!

Darren

avandonk · #5 04-12-2009, 09:21 AM

Great resolution Stuart. Was the data taken with your GSO RC? I have never found the usual colour assignments of narrow band satisfying. Assigning green to HA does show more detail as the human eye is far more sensitive to green.

Bert

Paul Haese · #6 04-12-2009, 10:30 AM

I think I like the second image best Stuart. Not sure about the others. The third does look ok but a little over done on the red side for my tastes. Detail looks good and as with mine it has great scale. Thanks for posting.

Rob_K · #7 04-12-2009, 12:05 PM

Nice work Stuart, tons of detail there!

But looks a bit too red to me as well.

Just as a matter of interest, can you tell me why you devoted 100 min to Ha and only 60 min to OIII, when Tarantula emits overwhelmingly in OIII? It's a very blue nebula!

Cheers -

Rob

multiweb (Marc) · #8 04-12-2009, 12:27 PM

Nice pic. The last one is my fav. The more neb the better. That's what I tend to like.

strongmanmike (Michael) · #9 05-12-2009, 07:58 AM

Nice experimental images Stuart

They all look ok to me, not much difference between them really but yes I like the highlited blue

Mike

rat156 · #10 05-12-2009, 10:12 AM

Quote:

Originally Posted by Rob_K

Nice work Stuart, tons of detail there!

But looks a bit too red to me as well.

Just as a matter of interest, can you tell me why you devoted 100 min to Ha and only 60 min to OIII, when Tarantula emits overwhelmingly in OIII? It's a very blue nebula!

Cheers -

Rob

Hi Rob,

The nebula does emit in OIII, but it is still overwhelmingly Ha. There's usually a rant by Peter Ward about this time of year when the unmodded DSLR pics of the nebula appear, and are all sorts of odd coulours. Anyway, for my images the Ha response is large, compared to the other two and as I have a 4.5nm bandpass Ha filter (which should enhance the contrast over the 13nm one I also use) the Ha became the luminance part of the image, hence it gets much more time.

Cheers
Stuart