All this talk about "equivalence" is silly

Started Jun 10, 2011 | Discussions thread
robert1955 Veteran Member • Posts: 4,029
Re: It's all silly and don't matter anymore

A lens does not projects a cone of light on the sensor plane . Basically that is a circle. The sensor is a rectangle within that circle, a bigger one for the FF than for the crop, but neither gets all of he light.

ffmitch wrote:

... An f/1.4 lens lets the same amount of light onto an aps-c sensor, FF sensor or a 35mm negative.

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