OLYMPUS OM-1N
The Olympus OM-1n is a mechanically operated 35mm film single-lens reflex (SLR) camera introduced in 1979 as an updated OM-1. Olympus kept it compact and built it for precision and durability. The changes over the OM-1 were small: better TTL flash metering, plus internal refinements to the viewfinder and metering system.
Overview
Released during a period of intense innovation in 35mm SLR design, the OM-1n was part of Olympus’s acclaimed OM series, which redefined what a professional SLR could be in terms of size and ergonomics. Building upon the original OM-1 (introduced in 1972), the OM-1n retained the fully mechanical operation, vertical-travel focal-plane shutter, and compact titanium-bladed shutter mechanism that made the series stand out. However, it incorporated subtle but important upgrades, most notably improved TTL (through-the-lens) flash metering support, making it more compatible with Olympus’s growing range of electronic flash units, particularly the T series flashes like the T32.
Olympus marketed the OM-1n to advanced amateur and professional photographers who wanted reliability, precision engineering, and manual control. Its sibling the OM-2 had aperture-priority autoexposure. The OM-1n stayed fully manual, which suited people who wanted direct control over shutter speed and aperture. It had a rugged all-metal body, a compact size for the era, and the Zuiko lens system behind it, and photojournalists, travel photographers, and enthusiasts liked it. The core optical and mechanical design matched the OM-1. The internal changes were a revised viewfinder mask and minor circuit updates to improve flash metering accuracy and reliability.
The OM-1n sat below the more automated OM-2n in the lineup. It was the flagship manual-exposure model until the OM-3 series arrived. It offered full manual control, a mechanical shutter, and compatibility with the entire OM-mount lens system, which spanned from ultra-wide-angle to super-telephoto designs.
Specifications
| Specification | Value |
| Type | 35mm Manual Focus SLR |
| Film Format | 35mm (135 film) |
| Years Produced | 1979–1988 |
| Lens Mount | Olympus OM Bayonet Mount |
| Shutter | Vertical-travel, titanium-bladed focal-plane shutter; speeds 1 sec to 1/1000 sec, plus Bulb |
| Metering | TTL Open-aperture center-weighted metering via CdS cell |
| Exposure Modes | Manual only |
| Viewfinder | Fixed pentaprism with 0.92x magnification, 97% coverage; focus screen with microprism collar and split-image rangefinder |
| Dimensions | 136 x 83 x 50 mm (5.35 x 3.27 x 1.97 in); ~590 g (body only) |
Key Features
- Fully mechanical operation: Operates without batteries for shutter functions; meter requires a single 1.35V mercury PX625 or modern equivalent (e.g., Wein Cell or adapter with 1.5V alkaline).
- TTL flash compatibility: Enhanced flash metering circuitry allows accurate TTL auto flash exposure with compatible Olympus T-series flashes.
- Compact, durable design: Part of the OM system’s hallmark miniaturization, featuring a lightweight yet robust all-metal chassis.
- Precision manual controls: Direct aperture and shutter speed dials with tactile feedback, ideal for deliberate, controlled shooting.
- Interchangeable focusing screens: Supports multiple OM-series focusing screens for specialized applications (e.g., macro, action).
Historical Context
SLR technology was changing fast when the OM-1n came out, with more automation and electronics. Nikon's FM2, Canon's AE-1, and Pentax's ME Super were pushing electronic exposure control and ease of use. The OM-1n went the other way and refined a proven mechanical design. Olympus also wanted to answer feedback on the original OM-1, particularly its flash metering limitations.
The OM-1n's improvements were evolutionary. The original OM-1's flash metering had required stop-down metering for TTL flash. The OM-1n enabled true open-aperture TTL flash metering, a real advantage with Olympus's T32 and T20 flash units. That put it on closer terms with contemporaries like the Nikon FM2n and Canon FTb, which also supported TTL flash. It had no autoexposure, and it stayed in production until 1988.
Collectibility & Value
The Olympus OM-1n is collectible today, particularly among fans of mechanical SLRs and users of vintage manual-focus systems. Prices typically run from $150 to $350 USD depending on condition, functionality, and accessories. Fully functional units with clean viewfinders, accurate shutter speeds, and working metering are in strong demand. Cameras with original leather and unscratched prism housings command premium prices.
Before buying an OM-1n, verify shutter accuracy across all speeds, check for mirror slap noise or hesitation, and make sure the meter responds correctly to light changes. Common problems are degraded light seals (replace them to prevent light leaks), stiff shutter curtains from dried lubricants, and CdS cell failure in the meter (often from corrosion or aging). The camera operates mechanically without batteries, but the meter needs a 1.35V power source. Modern 1.5V replacements can cause overexposure unless compensated. A Wein Cell (zinc-air) or voltage adapter is recommended for accurate metering.
Similar Cameras
- Nikon FM2 – Mechanically controlled SLR with titanium shutter, 1/4000 sec max speed, and TTL metering.
- Canon FTb – Rugged manual-exposure SLR with stop-down metering and FD mount compatibility.
- Pentax MX – Compact mechanical SLR with high build quality and 1/1000 sec shutter.
- Minolta SRT-101 – Classic CdS-metered SLR with robust construction and MC/MD lens support.
- Yashica FR-I – Manual focus SLR with TTL metering and Contax/Yashica mount.
Repair & Maintenance
The OM-1n uses a single PX625 (1.35V) mercury battery for its CdS light meter. Modern alternatives include the Wein Cell 625A (1.35V) or an adapter with a 1.5V alkaline battery (requires exposure compensation of -1/3 stop). The shutter is fully mechanical and needs no battery. Common maintenance issues are deteriorated light seals (recommended replacement every 10-15 years), shutter timing inaccuracies at slow speeds (often from dried lubricants), and meter needle sticking from internal corrosion. Professional CLA (Clean, Lubricate, Adjust) services are widely available and recommended for heavily used or long-stored units. Its modular construction makes it moderately repairable, though original spare parts may be hard to find. Regular use and proper storage in a dry environment significantly extend service life.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ OLYMPUS OM-1N Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $310 Latest $165 │ │ Median $160 Trend — │ │ Low $50 Volume ~9/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $400 ┤ │ │ │ │ │ │ .. . . │ │ $229 ┤ . . .. .. .. . . . . │ │ │ . . . . . ... .. . . ... │ │ │. .. . .. . ...... . ...│ │ │ .... ... .... ... │ │ $0 ┤ . . │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │▁▁ ▁ ▁ ▁▄▁▄▂▆▄▆█▅▄▅ ▁ ▁▄▅▅▄█▄▁ ▂▄▅▆▁│ │ └─────────────────────────────────────────────────────────────────│ │ 2025-11 2026-03 2026-07│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
Recently sold on eBay: $75–$260 (median $160, based on 85 completed sales, past 12 months)
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.