Roland W Offline Upload & Sell: On
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I have checked another combination of things. The body is full frame, the lens my Canon 16-35 f2.8 L II, and with a Lee 82mm wide angle adapter on it, and the Lee filter holder system hooked on the adapter. I put only one slot on the Lee holder, and then added the 105mm threaded adapter at the front that can accept a polarizer.
I first put my B&W 105mm polarizer on, and the one I have is kind of thick from front to back, so it is probably worst case. My filter projects about 12mm forward from the face of the 105mm threaded adapter. For that combination, the front edge of the polarizer vignettes at the 16mm focal length setting on the lens a little. By 18mm the vignetting is gone.
I next tried a "cheap" Zeikos multi coated polarizer, which is not as thick from front to back. This filter projected about 9.6mm from the face of the 105mm threaded adapter. For that combination with the thinner polarizer, the front edge of the polarizer vignettes at the 16mm focal length setting on the lens just a very small amount. By 17mm the vignetting is gone.
So one slot with a polarizer is reasonably usable, but it will depend on the thickness of the 105mm polarizer as to exactly how it works out. And getting a good multicoated circular polarizer that is also thin may be very dificult. The current B&W 105mm polarizers are not multicoated, and I am not sure how thick they are. The B&W I have I got used, and it is likely over 10 years old, so I don't know if current ones are the same thickness. I have no experience with any other 105mm polarizers yet. It would be nice if someone that has a Lee brand 105mm polarizer would measure how far it projects from in front of the face of the Lee 105mm threaded adapter. And by the way, 105mm polarizers are expensive, so you may want to just go for an 82mm polarizer, and forget combining things.
There is no question that a polarizer on a wide angle lens can result in big brightness gradients from one side of the image to the other, but I still find many uses for a polarizer on a wide angle lens. A polarizer does a lot for the color saturation of trees and many rock surfaces, depending on the lighting. I find my self wanting one on and adjusted properly for much of what I shoot in the Southwest. The need to combine it with a graduated neutral densitiy filter is much less often, but occasionally it could be usefull. Note that if you get a 105mm threaded adapter and put it on the front of your Lee holder, the adapter by its self causes no problems with vignetting, so it could stay on all the time with a single filter slot behind it, and you could add a 105mm polarizer when you wanted the combination.
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