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I don't think there is a ratio that you can use perse. You also need to consider the sensor size, the ASI1600 has the pixel density of a 65MP full frame sensor but you wouldn't want a full frame sensor with 3.8 micron pixels as there isn't many telescopes available (they're all VERY expensive) that can handle that pixel size off-axis. The shorter the focal length the less seeing conditions have an effect.
Shooting with a 50mm lens will ALWAYS be lens (and camera architecture) limited where as a 24" F10 will always be seeing limited unless using something like 24 micron pixels.
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