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f-stop explained with cats (lemmy.ml)

submitted 3 days ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 3 days 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?

[–] [email protected] 1 points 2 days ago* (last edited 2 days 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.

[–] [email protected] 18 points 3 days ago (1 children)

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

[–] [email protected] 4 points 3 days 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.