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The values you get are VERY conditional to what your imaging train is.
To talk about to different extremes we can talk first about the venerable FSQ-106 & 16803 combo. 9 micron pixels on a sharp 500mm telescope yielding 3.5"/pixel in focus in the centre of the image you'll see FHD around 1.5.
For a crazy comparison if you threw an ASI183/QHY183 on a Celestron C14; 2.4 micron pixels at 3911mm FL even under pretty darn good seeing of 1.5" you'll have a FHD around 12 but 20 wouldn't be unusual.
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