Quote:
Originally Posted by gregbradley
It would be worth a test. Its not a big point but its worth talking about.
The trouble with the overblown stars is not that you've over curved them or anything, that data is now gone in the highlights. These CCDs with small wells spill over to surrounding wells or the surrounding wells in the weaker diffraction rings swell up too much.
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Yeah true but how many images out there don't have a few blown stars? I could deal with this a bit better and maybe take some short subs to cover the blown data. That will get the best of both worlds.
Quote:
Originally Posted by gregbradley
I guess I see contrast more as the 16803 has 100,000 electron wells versus around 25,500 for the 8300. I didn't see these as a problem on your RC longer focal length shots because the narrower image spreads the flux over more pixels than the widerfield (I think I have that right).
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The RC images I thought were worse but I could be wrong there too.
Quote:
Originally Posted by gregbradley
If your tracking is super which your is then the gain in sharpness from less tracking error also helps give the image more snappiness I have noticed in my own 8300 images.
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Yes my guiding is pretty damn nice. Not bad for a supposedly stuffed mount (someone elses comments to me). It has made a huge difference to my images have great guiding.
Quote:
Originally Posted by gregbradley
I would not say those overblown stars are wrecking the image just that instead of being overblown whitish stars they could have been nice features with nice colours. Perhaps at the expense of deeper detail?
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Yeah that can be quite distracting. I see your point and agree.
Quote:
Originally Posted by gregbradley
I wonder what others' experience is on ideal exposure length. Marcus switched to 15 minute subs. I always used 15 minutes for subs but switched to 10 mainly because of the need for rounder stars not for overblown stars. I don't see any loss of reach or detail in later images using 10 minutes. Narrowband is different because Ha etc are so noisy they need longer exposures.
Greg.
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Yes I am always interested in what other guys (of gals) are doing as far as length of subs.
Quote:
Originally Posted by bmitchell82
.... I note that the subs are very noisy does QSI allow you to set your own offset and gain or is it a factory preset? .
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Brendan I can change the gain from high to low and that might well make a difference.
Quote:
Originally Posted by tilbrook@rbe.ne
Wow!!! 
What did they say in War of the worlds, oh yeah, something about watching earth with envious eyes.
Man I've got a long way to go!!
Great image.
Cheers,
Justin. |
Thank you justin but this is just the start of this image. It was part of the initial test of the new camera. I am sure I will produce something a lot better.
Quote:
Originally Posted by Rigel003
Congratulations on the new camera. Looking forward to lots of super cooled, noiseless images. How's the download time?
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Not as fast as your FLI Graeme. Reasonable at around 4 seconds or so for 1x1 binned images. For focus it is superfast.