Don: As a result of your thread, it has struck me that an APS sensor is not as good for macro work as a so-called full size one. I used to often stop down to F22 for DOF, and perusing John Shaw's book Close Ups In Nature, I see he did the same. But, as you have pointed out, at F22 diffraction is significantly impacting the sharpness, and APS will only exacerbate that effect. So while F22 is useable on a full frame sensor (slight image degradation), F22 on an APS sensor is pushing the boundaries a bit too much. I will try to do some tests to see if F22 is useable (my criteria being the quality of an A4 print).
Leif
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