Sensor sizes and f stops

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

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.

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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