17 55mm focal length (DX-format; 25.5 85.5mm equivalent in 35mm)
Constant f/2.8 maximum aperture
ED (Extra-low Dispersion) glass elements for sharp, clear images
Nikon SWM (Silent Wave Motor) for fast, quiet autofocus
Internal Focusing (IF) design for smoother handling
G-type lens with no aperture ring for simplified operation
The AF-S DX Zoom-Nikkor 17-55mm f/2.8G IF-ED is a professional-grade wide-angle to standard zoom lens designed for Nikon digital SLR cameras with DX-format sensors. It delivers superior optical performance with ED glass, Silent Wave Motor (SWM), and a constant f/2.8 aperture. Compact and user-friendly, this G-type lens offers precise performance without an aperture ring. Equivalent focal length: 25.5 85.5mm (35mm format).
17 55mm focal length (DX-format; 25.5 85.5mm equivalent in 35mm)
Constant f/2.8 maximum aperture
ED (Extra-low Dispersion) glass elements for sharp, clear images
Nikon SWM (Silent Wave Motor) for fast, quiet autofocus
Internal Focusing (IF) design for smoother handling
G-type lens with no aperture ring for simplified operation

Dedicated to the Nikon D850 DSLR, the MB-D18 Multi-Power Battery Pack offers both enhanced handling capabilities as well as extended battery life. It accepts one additional EN-EL15 lithium-ion battery pack to increase the camera's battery life or, alternatively, eight AA batteries can be used in conjunction with the included MS-D12 AA Battery Holder. Alternatively, an EN-EL18a/b battery can also be used in conjunction with an optional BL-5 Battery Chamber Cover in order to achieve a faster 9 fps shooting rate as well as an approximate battery life of 5140 shots per charge. The physical design of the grip improves shooting in the vertical orientation with the inclusion of a secondary shutter release button, AE/AF lock button, multi selector, and main- and sub-command dials.

