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 Post subject: Another swan
PostPosted: Sun Oct 10, 2010 8:51 pm 
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Cygnus, with something interesting going on with its back end (lower left). I reframed and am doing more shots of that now.

Very quick and dirty process. 17x30s ISO1600 35mm f/2, DSS+photoshop.

Haven't taken dark frames yet. Still need to look into doing flats.

The filter isn't a panacea, not did I expect it to be one, but the bright orange/red glow has now been replaced by blue/green glow and I'm not sure what to do about that yet. I assume that although a fair amount of light pollution has been cut, there is still also a lot of broadband light pollution which remains.

I did also note the filter introduced quite a focus shift. Infinity is now around 3m. Which explains why when I set the fisheye to a pre-calibrated infinity it was quite out of focus. I'll have to redo that.

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PostPosted: Sun Oct 10, 2010 9:03 pm 
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Quite impressive.
Which kind of filter do you use ? On lens, or the one that goes into the body before the lens ?

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 Post subject:
PostPosted: Sun Oct 10, 2010 9:18 pm 
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Fits in camera body between mirror and lens. More here.

My new shots have been foiled so I have called it a night. Lots of moisture gathering on the lens and other surfaces. I need a dew shield? Got a bunch of shots I can process still.

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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:
PostPosted: Sun Oct 10, 2010 10:55 pm 
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Different set to previously, but essentially same settings. Some 70+ went into this one, plus darks, flats, bias.

As it came out of DSS other than resize.

Image

Edit:

Went to look at camera jpeg as I'm sure I saw more on the screen than the DSS output. Sure enough, there is.

Image
Single shot of 30s, resize only from camera jpeg.

I guess I need to fiddle about more with the output settings...

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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:
PostPosted: Tue Oct 12, 2010 1:01 pm 
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Location: Bristol, UK
Great shot Popo.

I can clearly make out the North America Neb and youve got some great details in the rift as a whole.

Ive read somewhere before that the CLS filter does give a colour cast to images. Not sure what the right answer is for removing, but I wonder if a custom white balance would help?

Darks would really help and are easy to take at the end of the session.

The last lot of shots could be stretched more in DSS I reckon to bring out the detail. I often get disappointed with the result from DSS but after tweaking the RGB and luminance sliders I can usually tease out more detail.

I was out last night trying M31 if its cloudy tonight Ill be processing this otherwise Ill be back outside.

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 Post subject:
PostPosted: Tue Oct 12, 2010 4:36 pm 
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The 1st one in previous post has darks, flats and bias applied. I don't like the output mapping stage of DSS and need to figure out a way to either do better or export it and use something else. Haven't found a good way to handle the TIFs yet...

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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:
PostPosted: Tue Oct 12, 2010 5:54 pm 
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I know what you mean. It takes me ages to get anything decent out of DSS. Are you remembering to save the file with the edits applied from DSS? That took me ages to figure out - was doing all these edits, saving the file opening in PS and not getting the edits!!!

Have a look at the following site, there are some good tutorials which may help: http://www.astropixels.co.uk/Resources.htm

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