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If you do want an approximate rule of thumb, the maximum possible resolution of a perfect lens in lppm is roughly 1500/f number; so at f/8 you're limited to about 180 lppm, and at f/11 137 lppm.
Although if the lens is correctly centred it should be approaching the theoretical limit at these apertures, you will be fighting your low pass filter which won't allow you to reach these figures anyway. (Assumption; I haven't done the maths on your camera, but I know that the limits are normally under 100 lppm.)
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