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Hi again Andy.
apart from resolution, sensitivity also varies with aperture. The attached graphs show how resolution and relative sensitivity vary with aperture for practical systems around 0.75arcsec sampling.
resolution flattens out pretty well by 200mm (within a few % of best possible), but the sensitivity increases with aperture. ie, set your focal length to 1.5m to match your pixels and then get the fastest scope that your mount will carry.
Although small scopes with small pixels will get similarly resolved results to larger scopes, they will take a lot longer to get there. Chips with small pixels do not make large scopes obsolete - they do however bring high resolution imaging within the reach of small scope/mount owners.
cheers Ray
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