Orion in Hydrogen Alpha - DSLR

[cazza132 (Troy Casswell)]

A narrowband Ha filter (Astronomic XL Clip 12nm Ha) was used on a full spectrum 6D.

Full spectrum 6D, Zeiss 135mm f2.0 at f2.5
6x210s light frames, 12 darks, 16 flats, ISO3200, f2.5

Deep Sky Stacker and Photoshop CS6 was used to process.

[Bassnut (Fred)]

gee, thats a very dense image, looks excellent (I think). I like the way you coloured the mono Ha. In this case looks way better than B/W. Given the size of 6D chip, a 200kb thumb nail is a bit savage, not doing yourself any favors there.. Perhaps you can link to a higher res in the future?.

[multiweb (Marc)]

Really deep barnard loop. Excellent details too. Well done.

[pmrid (Peter)]

Originally Posted by Bassnut

I like the way you coloured the mono Ha. In this case looks way better than B/W.

Am I right in thinking he hasn't coloured the image at all? I think it's just the red end of the spectrum admitted by the 12nm Ha filter onto a full-color sensor.

Peter

[glend (Glen)]

Originally Posted by pmrid

Am I right in thinking he hasn't coloured the image at all? I think it's just the red end of the spectrum admitted by the 12nm Ha filter onto a full-color sensor.

Peter

That's the natural colour. It's a full spectrum camera, so even without the narrowband Ha filter it would have substantial red cast. There is just so much Ha out there that it tends to overwealm the other colours on a colour camera unless filtered out. The full spectrum Canon will capture up to five times as much Ha light as an un-modified camera due to the absence of the blue cast IR/UV filter ahead of the sensor, filteting for only narrowband Ha will further reduce the other colours.

[cazza132 (Troy Casswell)]

Bassnut - Thanks! Yeah, I need to upload my photos to flickr or astrobin, etc.

Multiweb - Thanks!

Peter and Glen

Ha on a modded DSLR comes out straight red in the raw file. Yes, the full spectrum modification allows many times more Ha light - 5 times seems about right.
After integration in DSS, I desaturated the image somewhat to reveal more detail in the stronger Ha regions - hence the pink-white around the horsehead and M42 (which otherwise would be blown out red).

[Camelopardalis (Dunk)]

Beautiful, well done Troy

[Ross G]

A great looking wide field photo Troy.

Love the composition.

Ross.