Fast aperture, medium telephoto portrait lens for great stills and D-Movie HD videos Designed for use on Nikons FX-format D-SLR cameras, this updated medium telephoto f/1.8 lens is designed for shooting stills or D-Movie HD videos. The AF-S NIKKOR 85mm f/1.8G features Nikons Internal Focus (IF) system providing fast and quiet AF and produces sharp and clear images at all apertures. Its fast maximum aperture is ideal for taking stills or D-Movie HD videos under ideal lighting, in low light, head and shoulder portraiture, weddings or concerts. When mounted on a DX-format D-SLR, the AF-S NIKKOR 85mm f/1.8G has an effective field of view of 127mm. Internal Focusing: Imagine being able to focus a lens without it changing in size. Nikon"s IF technology enables just that. All internal optical movement is limited to the interior of the nonextending lens barrel. This allows for a more compact, lightweight construction as well as a closer focusing distance. Nikon Silent Wave Motor: A significant innovation in AF lens technology, Nikon"s Silent Wave Motor uses ultrasonic (inaudible) vibrationsrather than a gear systemto focus the lens, providing incredibly smooth, silent and precise autofocus operation. M/A Focus Mode Switch: When fine manual focusing is needed, simply rotate the lens focus ringM/A mode allows you to seamlessly override the AF system with virtually no time lag. Super Integrated Coating: Nikon"s Super Integrated Coating enhances light transmission efficiency and offers superior color consistency and reduced lens flare.