Olympus's classic OM fast normal — the G.Zuiko Auto-S 50mm f/1.4, warm early rendering.
The Olympus OM-System G.Zuiko Auto-S 50mm f/1.4 is a fast standard prime for the Olympus OM mount, dating from 1972 and the launch of the OM-System. The G.Zuiko prefix is Olympus's element-code marking, and this early version sat as the fast normal in the original line-up. It was the everyday high-speed fifty for OM-1 buyers.
This is a manual-focus Olympus OM lens with a 50mm focal length and a maximum aperture of f/1.4, marked Auto-S as an automatic-diaphragm standard lens. The G.Zuiko code identifies its element grouping within Olympus's naming scheme. The dependable specifications are the 50mm focal length, the f/1.4 maximum aperture and the manual-focus OM mount; exact element count, weight and filter thread are omitted here rather than guessed.
A 50mm f/1.4 is the classic all-round fast normal, giving a natural field of view with the speed for low light and shallow depth of field. This early G.Zuiko version is valued for its rendering, with pleasant background blur and a slightly warm, classic look at wider apertures. It handles portraits, street and general shooting and remains a mainstay of the OM system.
The 50mm f/1.4 was made in large numbers so used copies are common and reasonably priced, with the earlier G.Zuiko versions of particular interest to collectors. Check the glass for haze and fungus, which fast fifties can develop, and confirm the aperture blades are clean and dry. Test the focus and aperture rings for smooth operation. It is one of the most-adapted OM lenses on mirrorless thanks to its speed, size and character.