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 Post subject: Still loopy
PostPosted: Thu Dec 29, 2011 12:28 am 
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Just another quick attack on Barnard's loop around Orion, picking up the usual suspects on the way. The sky was kinda annoying tonight. It seemed quite clear of orange light pollution to the naked eye, but I couldn't see "deep" myself with for example not even the whole of the W of Cassiopeia was visible.

H-alpha only data. Combination of:
14x2 minutes ISO1600
7x4 minutes ISO400
5x4 minutes ISO1600

Modified Canon 450D, Astronomik H-alpha filter, Zeiss 50mm f/2 makro.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Last edited by popo on Thu Dec 29, 2011 1:02 am, edited 1 time in total.

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PostPosted: Thu Dec 29, 2011 12:48 am 
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To the brave the spoils. Like you I looked at the sky once it got properly dark and the transparency was really poor so, unlike you, I took the evening off. My bad! Hopefully I'll get my own chance sometime in the next month.

What benefit do you see by changing the ISO as opposed to just varying the exposure times to capture detail in the bright bits as well as capturing the faint bits?

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.
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OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
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 Post subject:
PostPosted: Thu Dec 29, 2011 12:54 am 
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The low ISO was a mistake on my part. I was concerned about highlight clipping, before sanity returned and I realised getting the low down stuff is far more important anyway. Having said that, the RAWs at the two ISOs don't look that different once normalised for viewing on screen, at least at a quick glance.

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Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
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 Post subject: Re: Still loopy
PostPosted: Tue Jun 12, 2012 10:47 pm 
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Another reprocessing revisit. Same data as the earlier post with my revised technique. This time around, because I think I'm better at gradient removal, I decided to push deeper into the shadows, and take out more stars while I'm at it. Of course the noise isn't pretty... but I think I am also getting more detail out. But for the really faint stuff, I'm never sure if it's real or if it is some residual noise from the processing.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject: Re: Still loopy
PostPosted: Wed Jun 13, 2012 9:21 am 
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Big improvement of the loop detail. Might a curve restore some of the highlight detail in M42?

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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 Post subject: Re: Still loopy
PostPosted: Wed Jun 13, 2012 11:34 am 
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I'll have to check but I think it was blown at capture, on some of those subs at least. I'd have to fill in with lesser exposures separately if so.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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