"Equivalence" demonstrated: Canon 5D and Panasonic GX1

Started Apr 27, 2013 | Discussions thread
Detail Man
Detail Man Forum Pro • Posts: 16,678
Re: "Equivalence" demonstrated: Canon 5D and Panasonic GX1

walkaround wrote:

There has been a lot of talk by a few people here about "total light", and how an f/1.4 lens on a m4/3 camera supposedly acts like an f/2.8 in regards to "light on the sensor", etc.

Don't believe it. They tell us that photons are particles - then they tell us they are waves. Bosh !

Other than slight differences in the magnification of the two lenses ... and the obvious DOF difference, ...

No big woof ...

... the exposures are equivalent. They are the same. When I print both photos on 4x6, they look the same.

May I suggest the more rigorous standard of viewing 2.0"x1.5" prints at a 6' viewing distance ?

"Total light on the sensor" is a meaningless concept. Exposure and density is not.

Hear, hear ! After all, the total light over a given time period that illuminates a unit area on the image sensor has absolutely nothing whatsoever to do with the same thing over the entire image sensor. Why anybody with a head connected to their shoulders would liken them is quite beyond me.

We all know that "equivalent" really means "good 'nuff for me". We bow to your pithy genius.

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