Nikon 24mm f/2.8 [AI, AI-S]
This manual focus lens incorporates CRC (Close Range Correction) which gives excellent corner-to-corner sharpness, even at close range. Some field curvature that may be troublesome if you shoot perfectly flat subjects at close range. Some coma is visible in the corners wide open. Prone to CA, flare and ghosting, but stopping down helps. Some vignetting wide open, but this is gone at f/4. Some barrel distortion. Best performance overall in the range f/5.6 to f/11.
The mechanical construction is exellent.
Central hot-spot when used for IR.
The AI version appeared in 1977. It was replaced by an optically identical AI-S version in 1981.
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mount: Nikon F.
Aperture range: f/2.8 to f/22.
Close focus distance (CFD): 30 cm / 0.98 ft (from sensor plane).
CFD magnification: 1:8.9 / 0.11X.
Filter diameter: 52 mm.
L x D, W: 46 x 64 mm, 290 g.
IR: Poor IR performance.
Approximate street price: USD 540 (new, w/o tax).
Nikon is a multinational corporation headquartered in Tokyo, Japan specializing in optics and imaging. Its products include cameras, lenses, flash units, scanners, binoculars, microscopes, measurement instruments, and steppers (used in semiconductor fabrication). The company was founded in 1917 as Nippon Kōgaku Kōgyō Kabushikigaisha (Japan Optical Industries Corporation), and renamed Nikon Corporation, after its cameras, in 1988. Nikon Corporation is one of the companies of the Mitsubishi Group.