NGC 3576 Statue of Liberty in SHO

Robert_T · #1 31-03-2021, 10:28 PM

This is a new target for me and only my second serious attempt at mono. I am enjoying the greater range of colours I get to play with in mono and am happy with my new narrowband filters than seem less prone to halos compared to the Lextreme (which is still an excellent filter for OSC).

The antlia ultra filters appear very effective and I like the scale and pixel size of the ASI294mm at 2x2 at least...will try 1x1 on my askar400 with 0.7 reducer at some point but for now using my APM130 and Riccardi 0.7x. Some tilt still to be resolved but reluctant to waste precious clear skies resolving.

12hours of data integrated.

Taken over two nights with plenty of cloud leading to quite an imbalance in the numbers of subs from the three narrowband filters, around 4 and half hours each of Ha and OIII and only a little under 3 hours of SII. One of the challenges I guess of mono... tried to do some more SII tonight, but clouded out.

Stacked, combined and pre-processed in APP and separately combined APP filter stacks in Startools (both as SHO).

The highlights were better protected in the Startools process so in PS I combined the best of both in the result here.

Fuller res on astrobin https://astrob.in/5te3pk/0/

gregbradley · #2 31-03-2021, 10:45 PM

Very nice. I don't normally warm to the green colour scheme but it looks great on this one.

Greg.

Ryderscope (Rodney) · #3 31-03-2021, 10:57 PM

Nice work Robert. You're making good progress with your mono setup.

CoolhandJo (Paul) · #4 01-04-2021, 07:25 AM

Very nice detail. Those sucker holes make it hard to get meaningful data when the cloud is scattered! Interesting target that many are imaging these days. Ill have to image that one day. Great work

multiweb (Marc) · #5 01-04-2021, 09:24 AM

An exceptional shot of a faint one. Heaps of details to peruse in the high res. Excellent starfield resolution and the colour fidelity also shows exactly what is what and where in that shot which is the purpose of narrowband. No orange and blue pizza carpet bombing in that one. Well done. One for the cool wall.

Robert_T · #6 01-04-2021, 04:45 PM

Quote:

Originally Posted by gregbradley

Very nice. I don't normally warm to the green colour scheme but it looks great on this one.

Greg.

thanks Greg... i played around a bit but it seemed to want to be in the blue-green palette... seems to retain more detail

Robert_T · #7 01-04-2021, 04:45 PM

Quote:

Originally Posted by Ryderscope

Nice work Robert. You're making good progress with your mono setup.

thanks Rodney, and in the main "I'm lovin' it" :-)

Robert_T · #8 01-04-2021, 04:47 PM

Quote:

Originally Posted by CoolhandJo

Very nice detail. Those sucker holes make it hard to get meaningful data when the cloud is scattered! Interesting target that many are imaging these days. Ill have to image that one day. Great work

thanks Paul, I must have chucked around 3-4hours of clouded out subs which is a bit painful, but that's the nature of our beast I guess :-) I hadn't much noticed this target before...though it must have been northern hemisphere and only went to try it when saw it's southern declination.

Robert_T · #9 01-04-2021, 04:49 PM

Quote:

Originally Posted by multiweb

An exceptional shot of a faint one. Heaps of details to peruse in the high res. Excellent starfield resolution and the colour fidelity also shows exactly what is what and where in that shot which is the purpose of narrowband. No orange and blue pizza carpet bombing in that one. Well done. One for the cool wall.

thanks marc, appreciate the kind words. Maybe I should get a cool wall at home... I could line my home office that is a converted closet...my wife refer's to as "your box" ;-)

strongmanmike (Michael) · #10 01-04-2021, 05:05 PM

Yeah, I don't mind the greeny look either Robert, nice clean looking job

Mike

AdamJL · #11 01-04-2021, 05:19 PM

Oh I like that very much, Robert! Colour is subjective, but the composition on this works really well.

Robert_T · #12 02-04-2021, 10:59 AM

Quote:

Originally Posted by strongmanmike

Yeah, I don't mind the greeny look either Robert, nice clean looking job

Mike

thanks mike.

Robert_T · #13 02-04-2021, 11:01 AM

Quote:

Originally Posted by AdamJL

Oh I like that very much, Robert! Colour is subjective, but the composition on this works really well.

thanks Adam, i'm trying to think more about composition before pressing start. This is also the first time I've done a more "portrait" orientation ... seemed to suit this subject more.

Robert_T · #14 05-04-2021, 12:28 PM

thought I'd have a play at a Starless version using Starnet++

this is really heading more into the territory of abstract art than AP, but more for fun. Starnet++ does a good job at removing stars but the noise introduced is huge.

Better veiwed when shrunk down.

lazjen (Chris) · #15 05-04-2021, 01:41 PM

Neat, definitely agree it's well into art territory. You've inspired me to have a go too.

Robert_T · #16 06-04-2021, 05:20 PM

Quote:

Originally Posted by lazjen

Neat, definitely agree it's well into art territory. You've inspired me to have a go too.

thanks Chris. It is some fun. I'd be interested if you find a way to "de-star" without a major noise increase.

multiweb (Marc) · #17 06-04-2021, 07:05 PM

Quote:

Originally Posted by Robert_T

Starnet++ does a good job at removing stars but the noise introduced is huge.

What is perceived as noise is the holes punched out where the stars were. Depending on your star profiles the effect might be greater or less. If your captured data has a good fwhm then your stars won't be intrusive. One of the issue I see all the time in images processed with Starnet++ is the decoupling between the nebulosity and the starfield. It looks like two separate layers in most cases and ruins the field.