Quote Originally Posted by neuroanatomist
If that's under-exposed, you can bump the shutter or the ISO one stop and you're set.

That's a good point!


Quote Originally Posted by neuroanatomist
In the 72mm filter diameter, the B+W 0.6 (102) is about half the cost of the 0.9 (103) - $40 vs. $80 - and I expect that accounts for the 0.6 being 'the most popular'.

Another good point. And I suspect that many other users are also using it for f/1.8 (popular for Nikkor and Canon's glasses) or even f/2. Then 0.6 might be enough... Just my 2 cents...


Quote Originally Posted by neuroanatomist
Have you considered the expensive option of the Singh-Ray variable ND filter?

With $400 (filter + step-up ring), I rather save up another 1 grand to get 50mm f/1.2 L. []


Quote Originally Posted by neuroanatomist
Vignetting might not be an issue anyway - what body are you using? If it's a crop body, with an L lens you will probably not see much vignetting even with stacked filters.

I switch using it between 5D2 and 40D. But since my 24-70 needs the full frame more than this 85mm, I think you hit the bull eye that the vignetting might not be an issue as they are cropped out in the first place.