What is the thinnest variable ND in 82mm?

The Singh-Ray 'thin mount' sounds like it has lower profile specs, but before I buy I'd love to hear if anyone has gone through and tested wider lens vignetting on the various brands of variable NDs. Shooting a Mark3 with a 16-35mm.

The regular profile Singh-Ray that I rented started to vignette at about 26mm and below.

Thanks,

Chas Isenhart

I've got a Light Works variND and I really like it. It is on my 24-105 L lens and 35mm Rokinon lens. No vignetting unless you stack it on top of a UV Haze filter. Even then, it is very minor. They get around the vignetting by essentially stepping down the filter... so you end up with a slightly larger front piece of glass that won't fit the 77mm lens hood very well.