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Old 13-05-2016, 10:41 AM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
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Quote:
Originally Posted by glend View Post
There is an interesting post by mclark over on dpreview dealing with the SNR approach and 'lucky imaging'. His wobbling video examples are very interesting, and the high resolution results impressive.

http://www.dpreview.com/forums/thread/3992021

In my view "lucky imaging" is just as worthy (if not more) an approach as Adaptive Optics, and much cheaper. Why try to move surfaces to stablise an image when you can just align selected high rate exposures to produce a sharp stable result. As mclark at dpreview noted, dithering is a problem in high rate exposures due to the time taken to settle and you certainly could not do it on very short subs. This means to me that the use of flawed sensors that rely on dithering to process out the flaws probably is going to disappear as short sub video capture evolves around the new sensor generation.
Dithering may not be such an issue Glen, because you will not need to wait for a guider to settle - you won't need a guider at all if the subs are short enough. Just wait long enough for the mount to get to a new position (maybe a second?) and start imaging.

In fact, if we can reduce the exposures enough, mount quality becomes pretty much immaterial - something good enough to keep the scope off the ground and roughly pointing in the right direction should do. Expect an EQ6 renaissance and a lot of huff and puff from the top end suppliers.

In the words beloved of "consultants" from a decade or two ago, this is the foothills of a paradigm shift.

Last edited by Shiraz; 13-05-2016 at 11:16 AM.
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