Canon EF 16-35mm Æ’/2.8L II USM ~$1,700 but unlike the 16-35 F/2.8 Mark II with it's 82mm thread mount, this one comes with a more common 77mm thread.
Canon EF 16-35mm f/2.8L III USM Ultra Wide Angle Zoom Full Frame Lens ; High-performance L-series ultra-wide-angle zoom lens with constant f/2.8 maximum aperture, All new optical design for significant improvements in outer & corner sharpness, Circular aperture helps deliver beautiful, soft backgrounds
The Canon EF 16-35mm f/4 L IS USM is one of the finest wide-angle lenses Canon has produced. Used Canon EF 24-70mm f/2.8 L II USM. which can easily beat the Canon workhorse 16-35/2.8. I am EF 16-35mm f/2.8L II USM, an ultra-wide angle f/2.8 L-type zoom lens, adopts a new 16 elements in 12 groups optical design for delivering superior image quality. Featuring 3 types of high-precision aspherical lenses, the combination provides excellent peripheral image quality in wide-angle shots. Two UD lenses are incorporated to compensate chromatic aberration, ensuring sharp and high quality IQ7NOV.