Sensor sizes and f stops

Started 7 months ago | Discussions thread
darklamp
Senior MemberPosts: 3,107
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No correlation
In reply to Christof21, 7 months ago

There is a correlation between sensor size and f-number.

No there isn't.

f-numbers are defined precisely to remove any correlation between aperture size ( i.e. the absolute measurement ) and the sensor.

You can calculate an equivalent f number by multiplying by the crop factor.

That's not a correlation.

http://en.wikipedia.org/wiki/Correlation_and_dependence

That's you defining another value using two others. Your new value has a dependence on sensor size, but the f-number you start from does not.

As I've already explained, that kind of equivalence is limited to depth of field.

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