Olympus 12/2 at what point does this lens reach full sharpness?

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Lumixdude
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Olympus 12/2 at what point does this lens reach full sharpness?
8 months ago

I have some shots focused to infinity at F/2.8 and they are decidedly soft. However, I was just testing and stopping down to F/4 seems to provide a sharper image, at what point does this lens reach full sharpness and should I be worried about it being soft at these kinds of apertures?

I have a made in Japan copy.

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