Everyone who was on the New England Fall trip with David worked with ND and variable ND. They were so valuable, every one bought into David’s system. I suspect he will be answering you too. But from a user perspective there was no vignetting issue with the 35 using screw in polarizing and ND filters. We also used David’s “external” system for ND and variable ND, with no vignetting and which can be viewed anywhere
I don’t know what to say. David had a Leica R 400mm converted to S mount and it is a wonderful combo in good light (he let me demo it so I speak from first hand knowledge). The key here is good light (meaning very bright light). I desperately want a long telephoto for use with my S2, but the reality is that its use is limited by the need for high shutter speeds to achieve critical sharpness and the lowish usable ISO capabilities of the S2. The combo is great in good light, but that is tough to come by in the field. I had difficulty using the 180mm in the field recently due to low light and slow shutter speeds. Using a tripod doesn’t entirely solve the problem because even slow moving animals will cause motion blur at 1/30th to 1/60th of a second.
I fear a cmos based DSLR and a fast super telephoto lens with image stabilization is a better tool for the job. I hate to admit that because I sold such a combo not too long ago.
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