Nikon's DX ultra-wide zoom — 18-36mm equiv at constant f/4 with AF-S motor and ED glass.
The Nikon AF-S DX Nikkor 12-24mm f/4G IF-ED was released in 2003 as the professional ultra-wide zoom for Nikon F-mount DX APS-C bodies, covering 18-36mm equivalent. Eleven elements in 7 groups. Seven aperture blades. 77mm filter thread. At 465g. 0.30m MFD. SWM autofocus.
Eleven elements in 7 groups (ED glass). Seven aperture blades. The 77mm filter thread. At 465g the lens is moderate. Minimum focus distance of 0.30m. SWM (Silent Wave Motor) for fast, quiet AF with full-time manual override. f/4 constant aperture. DX image circle (APS-C only).
The 12-24mm f/4G was Nikon's professional DX ultra-wide at launch: 18-36mm equivalent covers from moderate wide to extreme wide for DX landscape and architectural photography. The constant f/4 aperture and SWM motor positioned it as the professional DX ultra-wide option before the Z-mount era. DX-only coverage means significant vignetting on FX bodies.
On the used market the Nikon AF-S DX Nikkor 12-24mm f/4G is affordable as a professional DX ultra-wide. Condition checks: SWM AF response, 77mm front element for marks (prominent at 12mm). DX only — vignetting on FX full-frame. Compatible with Nikon F-mount DX bodies (FX crop mode recommended).