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PostPosted: Tue May 06, 2014 11:22 am 
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Joined: Sat Sep 30, 2006 4:30 pm
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Location: UK
Hi folks,

I've been pretty absent from the forum for a while but I thought I'd share another of my reworkings of the Hubble Space Telescope's data.

The aim with this one was a natural looking colour balance, a little 'sparkle' from those young blue stars, clarity of the dust lanes and the addition of enhanced hydrogen emission nebulosity. The image below is merely a thumbnail, albeit one that's 1024 pixels widel: I have provided a 5750 pixel wide version (50% scale) which you can access by clicking here.

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      M51, a.k.a. The Whirlpool Galaxy

The following HST unstretched files were used: Red, Green, Blue, Ha. With the RGB channels mapped to Hubble's 814w, 555w and 435w filters saturation out of the tin was a little high and the initial colour balance was rather too cyan/blue. Adding the Ha data, processed with PixInsight's HDRMST tool to reduce the background brightness in the cores and spiral arms, helped correct the colour balance. Processed entirely in PixInsight and Photoshop CS6.

If you'd like to read a little more about M51 then this Wikipedia's article is a good starting point.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Wed May 07, 2014 12:20 am 
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Joined: Sat Sep 12, 2009 2:03 am
Posts: 1451
Location: Gold Coast Australia
The galaxies are amazing Bob, thanks for sharing.

Cheers

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Nikon D7000, Nikkor 80 - 400G, Nikkor 18- 200 VR II, f3.5-5.6.


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