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I tried two different tests and got slightly different results. Needless to say if I do have the problem it's very minor on my lenses (nothing wide and fast), but I'd still like to know. Can anyone that has tried multiple tests recommend the best setup to diagnose the problem? Most of the tests leave out some specifics like exactly how far to set up the camera to the test charts/objects for each focal length, how big the charts/objects should be, minimum shutter speed, etc.
My widest/fastest lenses atm are 24-70 2.8, 50 1.8 and the DX 35 1.8 (which I imagine would work since all the focus points are within the DX crop). Unfortunately I'm also waiting on my RRS plate to ship, so I was using a $20 tripod with a non-AS head so I could adjust the direction. I'll try my next test with a real tripod, just without a ball head.