The correct definition of minimum aperture is the smallest 'hole' size that the lens is capable of. I.e. at the highest f-number - f/16, f/22 etc. and, just to make it clear, showing the darkest image. Maximum aperture, OTOH, means the biggest hole size, smallest f-number and gives the brightest image. K+F's aperture control adapter for Nikon G ... More @Wikipedia
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