This may be more appropriate in another forum. Please move if necessary.
I've been noticing soft images with my Canon 100mm f2.8 Macro (non-L) at f32 and offer this comparison. Focus point is on flower part closest to camera and was not touched between exposures. No processing done here except cropping. Notice how soft the object is at F32 compared to f8. Other techs below.
Is this diffraction in action or maybe focus shift? If diffraction, which I suspect, how do you obtain sharp images at f32?
Model: Canon EOS-1D Mark IV
Lens: EF100mm f/2.8 Macro USM, 100 mm
Program: Manual
ISO 800, 1/30s f8 and f32
Flash: on
tripod mounted, mirror up, self timer on 2s