Hi Everyone,
The question remains about oversampling & undersampling.
I have a 10" f4 scope using a KAF8300 sensor.
It has 5.4 um pixels.
My arc-sec/pixel = 1.11
http://www.wilmslowastro.com/softwar...m#ARCSEC_PIXEL
Therefore if say - my seeing conditions are very good
I will get 2 arc seconds FWHM.
Using the Nyquist sampling theorem you need double the
arc-sec/pixel ratio - follows that to sample 2 arc seconds you need a minimum of 1 arc second per pixel.
Therefore I am slightly under sampled at 1.11.
In theory I can gain something from using drizzle.
I think that the above theory is wrong & you really need 3 x to be correctly sampled
as the pixels are square & not round like stars:
https://astronomy.tools/calculators/ccd_suitability
I certainly noticed a difference - an improvement - using 3 x drizzle
on my last image.
I got that little bit more detail when zooming in on tiny structures.
I was always interested if Mike Sidonio could gain anything by using drizzle.
I checked & he's oversampled so in theory he can't but
I would like to see the results - if only I could twist his arm.
cheers
Allan