Olympus's compact OM wide-angle — the G.Zuiko Auto-W 28mm f/3.5, small and versatile.
The Olympus OM-System G.Zuiko Auto-W 28mm f/3.5 is a compact wide-angle for the Olympus OM mount, dating from 1972 and the first generation of OM-System lenses. The G.Zuiko prefix denotes an element-count code in Olympus's naming scheme, where the letter indicates the number of optical groups or elements. It served as an affordable, pocketable moderate wide for OM photographers.
This is a manual-focus Olympus OM lens with a 28mm focal length and a maximum aperture of f/3.5. The G.Zuiko code marks its place in Olympus's element-lettering system, and the Auto-W token identifies it as an automatic-diaphragm wide-angle. The reliable specifications are the 28mm focal length, the f/3.5 maximum aperture and the manual-focus OM mount; exact element counts, weight and filter thread are omitted here rather than asserted without confirmation.
A 28mm gives a natural wide field that takes in more than a 35mm without the strong distortion of extreme wides, making it a versatile choice for landscapes, travel, street scenes and interiors. The modest f/3.5 aperture keeps the lens small and light, in keeping with the OM system's compact philosophy. Stopped down it delivers even, dependable results across the frame for general everyday shooting.
This was a common OM lens so used copies are plentiful and generally inexpensive, making it an easy entry point into the system. Check the front and rear elements for haze, fungus and cleaning marks, and confirm the aperture blades are clean and oil-free. Test the focus ring for smooth, even movement and check the aperture ring clicks positively. It adapts readily to mirrorless bodies as a small, characterful wide-angle.