Strange Filter Question

A friend just bought a polarizing filter for one of his lenses. He wears polarized glasses. What effect, if any, will the wearing of polarized glasses have with the using of a polarizing filter?

Thanks.

Things are likely to go very dark as he rotates the filter

I figured the glasses would have a reverse effect on the filter.

no... do you know how polaized lenses work? they are basically cross hatched with the polarized material.. same with filters... thats how they clock out the sun rays that come into the glass.

If he got a circular polarizer, he won't see anything any different than if he wasn't wearing the polarized sunglasses. If he got a linear polarizer, when the polarizer and his sunglasses are oriented at right angles, it'll black out.

Jon wrote in post #7895423
If he got a circular polarizer, he won't see anything any different than if he wasn't wearing the polarized sunglasses. If he got a linear polarizer, when the polarizer and his sunglasses are oriented at right angles, it'll black out.

Not so, you'll get some whacky patterns. Not recommended.

Bearmann wrote in post #7896199
Not so, you'll get some whacky patterns. Not recommended.

Go try it. I don't wear sunglasses while shooting as a rule because they interfere with viewing the LCD, but the whole purpose of a CP is to "depolarize" the light rays after the "bad" ones have been screened out, for which it uses a quarter-wave plate. This "depolarization" is also why only CPs are recommended for use with any camera using a partially-reflective mirror to deflect light for either the AF sensors or the metering sensors. Half-silvered mirrors or other beam splitters also polarize the light passing through them so you do risk blacking out the sensors as you rotate a linear polarizer.

You may, in fact probably will, experience difficulties viewing an LCD display through polarizing sunglasses at some angles because LCD displays also rely on polarization. You'll also see stress patterns in e.g. plexiglass when viewed through polarizers, but that's because of the medium also affecting light transmission. So you probably don't want to use a polarizer when shooting through aircraft windows.