A constant f/2 zoom across the portrait range. That is a focal span normally covered by three primes, at an aperture zooms do not usually reach at all.
Four XD linear motors with floating focus drive it, and both zoom and focus are internal, so the lens never changes length — which means gimbal balance set at 50mm still holds at 150mm.
XA, aspherical and Super ED elements with Nano AR Coating II keep aberration and flare under control, and a fluorine coating sheds water and fingerprints from the front element.
Aperture de-click and lock switches, a removable tripod foot, dust and moisture-resistant construction, and a rounded 11-blade diaphragm for clean bokeh wide open and stopped down.
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