Olympus Zuiko Auto-Fisheye 16mm f/3.5 Lens for OM Mount

Description
The Olympus Zuiko Auto-Fisheye 16mm f/3.5 is a full-frame diagonal fisheye lens designed for Olympus OM-series manual focus SLRs. Introduced in 1975, it delivers a dramatic 180° field of view with pronounced curvature and edge distortion, ideal for creative compositions, architecture, and immersive landscapes. Compact and lightweight, it features a built-in rotating filter turret and advanced multicoating for vivid colour reproduction.

Condition
Overall Condition: Excellent

Optics clean with no haze or fungus. Aperture blades snappy and oil-free. Focus ring smooth. Built-in filters rotate freely.

Included

• Olympus Zuiko Auto-Fisheye 16mm f/3.5 lens
• Front and rear lens caps 

Collectors Notes
This lens was Olympus’s widest-angle offering for the OM system, rivaling the Pentax Takumar 17mm and Yashica ML 15mm in compactness and clarity. It features 11 elements in 8 groups and a minimum focus distance of just 20cm. The built-in filter turret includes UV, Yellow (Y48), and Orange (O56) filters in early versions, with later models offering Neutral Density and updated coatings. Its hoodless design and deep curvature make it a standout in any OM kit.

Key Features

• Focal length: 16mm (diagonal fisheye)
• Maximum aperture: f/3.5
• Aperture range: f/3.5 to f/22
• Optical design: 11 elements in 8 groups
• Angle of view: 180° diagonal
• Minimum focus distance: 0.2m
• Built-in rotating filters: UV, Y48, O56 (early); ND, Y48, O56 (later)
• Fixed lens hood (integrated curvature)
• Filter thread: none (internal filters only)
• Mount: Olympus OM bayonet
• Dimensions: 59 × 31mm; Weight: approx. 185–189g

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