Ikelite Compact DSLR Dome Port for Tokina 10-17mm Lens
This special port is designed specifically to take full advantage of the Tokina 10-17mm Fisheye lens at its widest. Zoom lenses behind a dome will be softer at some focal lengths than others due to the relationship between their floating nodal point and the position of the dome. This port positions the dome properly for sharp images at 10mm without vignetting. Get out there and start shooting Snell's Window!