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f-stop explained with cats
(lemmy.ml)
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this post was submitted on 25 Jun 2025
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someone care to explain to me why f1.4 is supposed to be the lowest f number jet i can buy a fresnel lens with a calculated f of 0.4?
Simple, f1.4 isn't supposed to be the lowest
Yeah, I have normal camera lenses lower than that. From memory, the F-stop number is like a ratio between the focal length and the effective diameter of the lens.
Where on earth do you get that idea? Lower is more expensive, so unless youre a pro, you dont see them as often.