Simple polarizer question

[don0234]

I am going to borrow a circular polarizer to use this weekend. Do I need to bump up the exposure in the camera? The thing looks kinda dark to me.

[kenw]

a polarizer will require 1.5 - 2 additional stops.

[boxofrocks]

Originally Posted by don0234

Do I need to bump up the exposure in the camera? The thing looks kinda dark to me.

Not if you are metering through the camera lens (TTL). If your camera is in an auto mode, (shutter priority, aperture priority, program, etc), it will compensate for the polorizer, since it "sees" through it. I don't know what kind of camera you have, but if it uses TTL metering, there's no need to do anything extra.

It looks darker, because it is, but the camera knows this, and automitically compensates.

Now if you are doing it old school, and setting the f/stop and ss based on a seperate meter reading, you need to compensate.