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 Post subject: Sun in CaK and Ha
PostPosted: Mon Jun 04, 2012 7:52 pm 
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As is typical every time the sun decided to come out from behind the clouds today, I was busy. And by the time I was free, it had gone back into hiding. Finally caught up in the afternoon and this happened:

Image
Celestron Nexstar 4SE
Baader CaK filter
Canon 450D all filters removed

Image
Coronado PST
Canon 450D all filters removed

Cloud moved in just as I got a few shots off with the PST so I gave up at that point. I have aligned the images above as best I could using the sunspots.

I've got a weird ghosting effect only when using the CaK filter which I think is due to the camera but I'm not sure what the mechanism is yet. Multiple offset (same orientation) images with fading intensity. Like the Sony SLT mirror issue but with much greater spacing.

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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
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 Post subject: Re: Sun in CaK and Ha
PostPosted: Mon Jun 04, 2012 8:03 pm 
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Great captures. Now, if you got two images taken close together in time with no cloud I wonder what detail would be seen if you subtracted one from the other and then superimposed a false colour version of that difference image back on the H-alpha? I've no idea if it would work, if the background of the difference image could be sufficiently neutralised and if the resultant image would either reveal interesting stuff or would produce an even bigger Wow factor. Just a thought... :)

Bob.

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 Post subject: Re: Sun in CaK and Ha
PostPosted: Mon Jun 04, 2012 8:32 pm 
Very cool, thanks for sharing!


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 Post subject: Re: Sun in CaK and Ha
PostPosted: Mon Jun 04, 2012 9:19 pm 
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Joined: Sun May 25, 2008 12:48 pm
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Location: UK
Bob, I already thought of playing with them in colour channels but this might be one for after I get the CCD. The noise here was pretty bad.

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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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