Aperture question, re: sharpness

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Aperture question, re: sharpness
2 months ago

Just a couple of musings that I'm posing to myself..

1. Is the absolute sharpest a lens can and will ever be, when it is stopped all the way down to its smallest aperture?

Follow-on from above,

2. If so, is that because it's using the very centre of the lens when it's stopped all the way down like this? Meaning that 1) will be true for each and every lens, without exception (well, except maybe ones designed to be sharper on the edges than in the centre...)?

Leading question in relation to above,

3. If a FF lens is stopped down to f/22, what is the f-stop on an m43 that would match the same exact PHYSICAL opening diameter of the FF lens @ f/22?

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