If I do not have a light meter, can I use the dslr to do the metering? I'm using canon 550D. The only metering I came across the dslr menu is about evaluative, spot, partial metering.
Reason I ask this is I saw a photography tutorial on youtube and this guy mentioned "the camera tells me I'm 2 stops underexposed". Is this translated from the histogram?
He also mentioned "let's see what is the aperture value required" after doing some setting on his camera for night shots.
Is it similar as using shutter priority, auto ISO, then the camera will show the required Aperture value?