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f-stop explained with cats (lemmy.ml)

submitted 1 day ago by cm0002@lemmy.world to c/funny@sh.itjust.works

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[–] einfach_orangensaft@sh.itjust.works 1 points 1 day ago (2 children)

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?

[–] higgsboson@dubvee.org 1 points 33 minutes ago* (last edited 33 minutes ago)

f1.4 is supposed to be the lowest f number

Where on earth do you get that idea? Lower is more expensive, so unless youre a pro, you dont see them as often.

[–] 9point6@lemmy.world 18 points 1 day ago (1 children)

Simple, f1.4 isn't supposed to be the lowest

[–] Fetus@lemmy.world 4 points 1 day ago

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.