Quote:
Originally Posted by Startrek
Understand what your trying to demonstrate
Gee that’s a mouth full
The equation I use with the Nikon D800 gives 2.52 arc sec per pixel
Very close to yours
As this is well over 2 arc sec per pixel that means your under sampled according to Nyquist, so stars will be blotchy or blocky ?
Is that correct ?
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In relation to the example I gave (Nikon D800 + Nikkoe 400mm f2.8), it was really just to illustrate how to calculate the image scale, from the field of view and sensor pixel specs. As to the star quality issue: A 400mm lens on full-frame yields a widefield image at 5.2 degrees wide. If you look at anything insanely closely / at high enough magnification you will always see something, but at the image scale we are talking about
: around 2.5 arcseconds/pixel, the seeing + guiding errors+ any optical abberations will also conspire to effect the image.
If you venture on to Astrobin and look at various images, for which the pixel scale is often quoted, you will find many astounding images (pixel peeped or not) at that sort of image scale.
Best
JA