Equivalent focal length and Exposure compensation

Started Jul 2, 2012 | Discussions thread
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Minos82 Forum Member • Posts: 52
Equivalent focal length and Exposure compensation

Hello All,
Two noobies question for the day:

-Equivalent focal length:

How is the equivalent focal length computed for cameras with different formats..ie. how do you compare 28mm equivalent on a 3:2 format of the RX100 to 28mm equivalent on a 4:3 format. Is it the angular angle along the diagonal? A solid angle?

-Exposition compensation
On some pictures posted here, I sometimes see something in the like of
28mm, 100 ISO, F2.8, 1/100, -0.33ev
In this case, what does -0.33ev means and what does it act on?

Is it -0.33ev below the 1/100 that was user selected, meaning the picture was taken at 1/133?

Is it -0.33ev below the F2.8 that was user selected, meaning the picture was taken at around F3.3?

Is it -0.33ev below the 100 ISO that was user selected, meaning the picture was taken at around ISO80?

What else could this -0.33ev act on?

Thanks,
Minos

Sony RX100
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