Quote:
Originally posted by MiG
But I don't see how F ratio relates to pixel size. I understand how 0.5 magnification ratio will result in your example, but not F ratio.
F ratio is just the focal length divided by the aperture.
I am missing a piece of the puzzle aren't I? What is your guiding method?
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The F ratio is important as the imaging chip sits at the focal plane, and not via an eyepiece which determines magnification.
More accurately its the focal length which will determine pixel size.