What the heck is an f-stop?

Started Apr 25, 2014 | Discussions thread
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Allan Olesen Senior Member • Posts: 3,358
Re: What the heck is an f-stop?

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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