Nikon's professional DX ultra-wide zoom — note: the f/4 aperture, not f/1.4 as listed in database.
The Nikon AF-S DX Nikkor 12-24mm cataloged with 'f/1.4G ED' aperture is almost certainly a cataloging error. The actual Nikon DX 12-24mm lens is the AF-S DX Nikkor 12-24mm f/4G IF-ED. f/1.4 at 12-24mm would be an extraordinary product that does not exist. Nikon F mount.
12-24mm focal length. f/4G ED (actual spec — f/1.4 per canonical name is a likely error). AF-S ring USM. DX coverage. Nikon F mount.
The AF-S DX 12-24mm f/4G IF-ED is Nikon's reference APS-C ultra-wide — a high-quality professional-grade zoom covering from 18mm equivalent. The f/1.4 aperture in the canonical name should be f/4. IF = internal focus. ED elements for quality.
On the used market, verify the actual aperture is f/4 (not f/1.4 per canonical name — almost certainly a cataloging error). Condition checks: ED elements, AF-S motor. Nikon F mount.