Compact Olympus OM telephoto zoom with constant f/4, quality Zuiko glass in a portable 75-150mm package.
The Olympus Zuiko 75-150mm f/4 is a compact telephoto zoom for the Olympus OM system, covering a useful range from portrait through to medium telephoto with a constant f/4 aperture. The 2x zoom ratio keeps optical compromises to a minimum while providing the most frequently needed telephoto focal lengths.
The constant f/4 aperture maintains consistent exposure and viewfinder brightness across the zoom range, simplifying manual exposure calculation and providing predictable depth of field behaviour. Optical quality is good for a telephoto zoom of this era, with sharp centre performance and acceptable edges at moderate apertures.
Build quality follows the Olympus OM standard with all-metal construction in a compact barrel that is remarkably small for a 150mm telephoto zoom. The lens complements the compact OM body design philosophy, creating a manageable travel telephoto that doesn't overwhelm the lightweight camera bodies.
The Zuiko 75-150mm f/4 offers good value on the used market for OM system photographers who want telephoto zoom versatility in a compact package. The constant aperture and quality Zuiko optics make it a practical choice for portraits, events, and travel where carrying multiple prime lenses would be impractical.