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The size of the Airy disk is:
2.44 x lambda x f ratio (in microns) where lambda is the wavelength.
So although the larger scope will gather more light it (due to the longer focal length) is spread over a larger linear disk.
The resolution will be defined by the seeing and the pixel size (Nyquist sampling) - so if each scope/ camera combo has the same arc sec/ pixel then under similar seeing conditions they will have the same effective resolution.
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