Quote:
Originally Posted by TrevorW
OK in the light of a full moon in the burbs what type of figures should I expect, I' started using NINA in the last two months to control everything - figures under the full moon show FHD around 5-6 rarely under 5 however when i stack in DSS FWHD return between 8-10, the stars have to my eye have been in focus, I have yet to to see figures under 4 FHD or the magical 2-3
My camera is a QHY268C Gain set at 56 offset 30
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As l understand it Deep Sky Stacker reports star sharpness as the
FWHM Full Width Half Maximum
in pixels. DSS does not have the ability nor the information about the focal length of the scope and imaging sensor size to help it determine the FWHM in say arcseconds used in some other software.
Nina, as I understand it (I don't use it) measures star sharpness using
HFR Half Flux Radius, which given its name suggests it's computed slightly differently using integration. Its units may be in pixels (TBC)
*, but given the difference in computational method, doesn't guarantee the star sharpness measures from DSS and Nina: FWHM and HFR respectively will be comparable.
Best
JA
* If Nina reports the sharpness in Arcseconds and that is what you are quoting
then DSS and Nina will definitely not agree since DSS is reporting the sharpness as FWHM in pixels