Chriscrawfordphoto
Real Men Shoot Film.
I'm not sure why a polarization filter would not be useful on any lens. What it does isn't made redundant by a high quality lens.
That's a good question, Bill. Polarizers don't reduce image quality if they're good quality (just like any other filter). I don't see why it couldn't be used on a 'quality lens' either.
The real issue is that the OP is using a Leica, and I assume he means a rangefinder, not one of their SLRs, which would make using a polarizer hard since you cant see through the lens to adjust its strength.