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im fine about it, but F.25 isnt possible fastest lens ever made is F.7
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Not true, microscope objectives run to NA 0.8 (air) or 1.2 (oil-immersion) which boils down to about f/0.4 admittedly you need to pay about 5000 euro, they have up to 15 elements and the front lens is only about 3 mm diameter.