Sensor sizes and f stops

Started Jan 25, 2014 | Discussions thread
darklamp Veteran Member • Posts: 3,567
Re: No correlation

I'm not sure if English is your first language, but "correlate" does not mean what you're saying it does.

If there was a correlation between f-number and aperture you could find the one from the other, assuming other factors were constant.

You cannot.

You are just defining a value and as you factor in sensor size that defined value has a correlation with sensor size.

But the original f-number has NONE.

And if you start using the so-called equivalent f-number you have defined, you cannot use it for exposure calculations. So they are not equivalent in real exposures as you would have to use different shutter speeds and/or ISO values for different sensor sizes to get the same exposure.

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