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Jupiter December 27, 2014 GRS from DEC Large

 

I over sampled more than I usually do. It paid some unexpected dividends. C14, Zeiss 2.6x Barlow, Blackfly GiG E w/sony 104 cmos, one shot color.

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Dan Llewellyn
 

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Really nice image !

Christian

Le 03/01/2015 06:07, maadscientist@... [C14_EdgeHD] a ¨¦crit?:

I over sampled more than I usually do. It paid some unexpected dividends. C14, Zeiss 2.6x Barlow, Blackfly GiG E w/sony 104 cmos, one shot color.

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Dan Llewellyn
 

Thanks. I was surprised imaging over 10 meter focal length paid some good dividends.?

Dan Llewellyn
 

That's really nice. It's surprising how much oversampling you really need. I usually go for an image scale that is about 3.3 times oversampling vs the diffraction limit of the scope (ie the Dawes or Raleigh limit).

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Drew S.
 

"surprising how much oversampling you really need"


The Nyquist criterion for sampling a Gaussian PSF is FWHM = 3.3 pixels. So?"3.3 times oversampling" may actually be proper sampling for the best frames.


The PSF?of very short exps?is not Gaussian?but rather a?variably convolved Airy disk/ring function, for which?the Nyquist criterion for?Gaussian PSF is not fully adequate.? Additionally, stacking introduces alignment issues that potentially degrade?sampling and thus benefit from "oversampling".


Stan

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