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Sorry but I'm not knowledgeable enough to answer those questions...
I would say however, that the lower the arc seconds per pixel, the higher the over all resolving power will be, hence better. I dont think you could get to a point where lower would become "worse"... more like - you would reach a point of diminishing returns, where as getting a lower arc sec/pixel rating will cost you $x more, but only give a tiny/no improvement.
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