What the heck is an f-stop?

Started 9 months ago | Discussions thread
Allan Olesen
Senior MemberPosts: 2,731
Re: What the heck is an f-stop?
In reply to D Cox, 9 months ago

D Cox wrote:

So the illuminance is directly proportional to the f number.

So if you change the f number with a factor of 2, you also change the illuminance with a factor of 2?

Or do you use an alternative definition of "directly proportional".

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