Nikon 16-35mm f4G ED N VR AF-S Nikkor tube Toyo put rails on the

Toyo put rails on the sides so you can also try to stuff it under your groundglass

Whether or not this is useful depends very much on whether you're feeling head-short

there's not much out there that will do a better job

In good working order

Nikon 16-35mm f4G ED N VR AF-S Nikkor tube Toyo put rails on theThe Nikon 16 35mm f4G ED N VR AF S Nikkor is a professional full frame ultrawide zoom lens for the F mount with a fast f4 constant aperture and a handy image stabilizer system for steadier shooting. This lens is in excellent condition, with only minor cosmetic wear, clean glass, and good function. Includes lens hood.