Singh-Ray 77mm (Thin Mount) Vari-ND Variable Neutral Density Filter Question

Hogloff wrote in post #10550388
How bad is the vignetting at say 20mm? Unusable or fixable?
Thanks

hmm...not sure what fixable vignetting is, but there is vignetting (not just dark corners, but intrusion of the circular frame into the shot) at 20mm on a 17-40 w/the vari-n-duo...i'd agree you're free of vignetting by about 25mm on that lens...

Hogloff wrote in post #10550388
How bad is the vignetting at say 20mm? Unusable or fixable?
Thanks

Don't have a shot at 20, but here's a few test shots that I took a while back to give you an idea. Its a great filter, as long as you're okay with working around some limitations. After all, it is 14mm thick.

5D2 with 17-40L @ 17mm:

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argyle wrote in post #10552712
Don't have a shot at 20, but here's a few test shots that I took a while back to give you an idea. Its a great filter, as long as you're okay with working around some limitations. After all, it is 14mm thick.

5D2 with 17-40L @ 17mm:

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5D2 with 17-40L @ 21mm:

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5D2 with 17-40L @ 25mm:

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Thanks for the examples, they really help. Many of my shots are at the wider end and it looks like from these examples, I would not be able to use this lens for them. Have to give it some thought.

Thanks