5D MkII Sharpness

[neuroanatomist]

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narrowest aperature possible

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You should adjust focus with the widest aperture possible, not the narrowest.

Great catch, Jon - I read that and translated it to 'smallest aperture number possible' (= widest aperture). Ifmatrixman45054 was testing at f/32, the enormous DoF with that narrow aperture would make AF microadjustment practically impossible!