Canon EF 17-40mm f4L brand_Canon This extension tube for LTM/39mm

This extension tube for LTM/39mm thread mount Summer & Elmar 5cm lenses is designed to provide 1:2 magnification

This lens is designed for the Canon EF mount

it's accurate

The D3s’ 12mp full-frame sensor can shoot at up to ISO 12800 (or 102400 in “extended” mode)

Canon EF 17-40mm f4L brand_Canon This extension tube for LTM/39mmThe Canon EF 17 40mm f4L is a high quality full frame wide angle lens for the Canon EF mount. Relatively small and lightweight (relatively) for an ultrawide zoom, this lens also has a pretty quick f4 constant aperture throughout its zoom range. In very good condition, with some paint wear on the nameplate ring. Includes a pretty decent aftermarket lens hood.