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Lee,
Don't confuse plate scale (arc sec/pixel) with resolution...
Using the Nyquist/ Shannon sampling model the resolution is usually 2 to 3 times the plate scale e.g. a 0.5 arc sec/ pixel may give 1 to 1.5 arc sec resolution.
The actual resolution of your system with depend on the PSF (Point spread function) and the seeing conditions.
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