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Has anyone had experience with stacking ND filters on the 17-40? I currently have a Kenko Zeta 77mm 3-stop ND, which has a thin filter ring and is super HMC coated. I was thinking about getting a 6-stop Hoya Pro1 ND and stacking the two to get 9 stops of light attenuation.
Would stacking these 2 thin-mount filters cause severe vignetting at 17mm on FF? I've read differing opinions on filters and vignetting with the 17-40L at 17mm, so I wanted to see if anyone here had first-hand experience.
Also, since both filters are multicoated, would the added flare/reflections not be so bad?