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| p.1 #3 · p.1 #3 · 16-35 II + step down ring + 77mm ND110 - Vignetting? |
Yes, it will cut into the image area, more at the UWA settings and less at the "long" focal lengths.
I tried to do this as well, just because I had do many 77mm filters on hand. IIRC, it was okay at 35mm setting, but around 28mm vignetting set in, and encroached on the image circle at somewhere around 20mm, and was rounded sides at 16mm. In a pinch, where you can later crop, the idea will work and you can use something like your ND or Grad ND filters. But you will be losing equivalent focal length by cropping.