Focal length 35mm equivalent, but not F-stop?

Started Jul 24, 2014 | Discussions thread
Lee Jay Forum Pro • Posts: 55,159
Re: Let's correct it, then.

Tim Tucker wrote:

Is this the same as saying all f2 lenses transmit the same amount of light, but different sensor sizes collect different total amounts for the same exposure?

No, all f/2 lenses transmit the same light intensity (illuminance), but the total light is the illuminance multiplied by the sensor area, so different sensor sizes collect different total amounts for the same exposure.

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Lee Jay

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