how do people with this lens manage using a polarizer without a filter screw?. also i am planning to use it later with Full frame will vignette be a problem?. i am not very pleased with my 17-40L on 30D especially shooting horizontally, vertically much improved to pleasing level but i need to shoot horizontally. some people became satisfied with 17-40L when they used it with full frame which i am planning to move to when 5D ll come out. i have noticed the 17-40L is sharp in the center but really bad toward the corners, really bad especially horizontally, even at f8-f13.
thanks

You don't. There is a drop in filter holder in the rear of the lens that can hold a few gel filters. I'm not sure a polarizer would work there though. Obviously you couldn't rotate it...

Seth is correct. Contrary to popular belief though, you can take a large rubber band and mount a ND grad (Cokin X pro or Lee's largest) on the front by fixing the filter to the camera body with the rubber band. Looks homebrewed because it is, but it works just fine.

The 14mm II is great everywhere, corners included, but is priced pretty high for what it is.

If you're looking to just darken the sky, you probably won't need a CPL with the 14L. Wide angle and ultra-wide angle lenses tend to darken skies as it is; nature of the beast.

You wouldn't be happy with the results if you could use a polarizer. The effect would graduate sharply across the image because of the changing angle to the light source (usually the sun). I have trouble with this often with the 16-35. With the 14 it must be way worse. I do have that lens, but never polarized it.

i see, but are you have with the results jeffrey?

Jeffrey wrote:
You wouldn't be happy with the results if you could use a polarizer. The effect would graduate sharply across the image because of the changing angle to the light source (usually the sun). I have trouble with this often with the 16-35. With the 14 it must be way worse. I do have that lens, but never polarized it.

Exactly... That's the other thing; CPLs aren't very usable on UWA lenses because of this. More often than not it produces very uneven polarization effects across the sky.

this will be a problem when i want to get rid of water reflection. it would be nice if i can hear from users their take on this issue.
thanks