Quick question about my polarizer.

SealBeard

SealBeard

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Rob
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Hi all, just a quick question...

I have a hoya pro1 Cir polarizer that I use on my 70-200 f2/8, just wondering if anyone knows of the top of their head about how much light its blocking so I can adjust my exposures according to my light meter so I get the correct exposure - cheers
 
It will probably be between about 1.3 to 2.3 stops depending on how you turn it and at what angle the light is coming into the scene.

If you want to get a rough idea simply aim your camera and bare lens at a white wall and set an exposure to give you a centred meter. Now fit the CPL and aim the camera again. See how far the meter needle drops and by how much it varies as you adjust the CPL. The effect will probably be different depending on whereabouts the sun is in relation to you and the wall, so it really won't be easy to come up with a single adjustment factor.

Personally I don't bother with a light meter. I simpy take a reading off my palm and set an exposure for +1.3 stops for my palm. That's just like metering from a grey card at +0. However, a palm is cheaper, quicker to find, never forgotten etc. etc.. Also, being flesh toned, it gives very accurate exposures for skin when shooting people. You could do the same thing, add the CPL and see how far the meter drops, and how much you need to ramp the exposure up to get back to +1.3 stops.
 
thanks for the responses, that sounds 'about' what I was thinking, just wanted to check though. I will test out the techniques you suggested also :)
 
Just bracket your shots, one stop either way. -1,0,+1
 
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