By 1985, Olympus had learned a lot from the OM-10, OM-20, and OM-30 experiments.
Photographers wanted simplicity, reliability — and a bit of smart automation without losing control.
Enter the Olympus OM-40 (also known as the OM-PC in North America):
the final serious amateur OM body, combining automation, manual control, and innovation into one clean, tough package.
The OM-40 didn’t change the game like the OM-1.
But it closed a chapter on a high note.
Innovation: Programmed and Intelligent Spot Metering
The OM-40 introduced two big new features:
- Programmed AE (Auto Exposure):
The camera could automatically choose both shutter speed and aperture for you —
a first for the OM series. - ESP (Electro-Selective Pattern) Metering:
A sophisticated metering system (for the time) that measured light from different zones of the frame,
intelligently reducing the risk of blown highlights or underexposed shadows.
It wasn’t full matrix metering like later autofocus SLRs —
but it was a major leap forward in intelligent exposure for Olympus.
Key Features of the OM-40
- Full Program Mode:
Automatic shutter speed and aperture selection.
Perfect for fast action or quick snapshots. - Aperture Priority and Manual Modes:
Switch instantly to classic aperture priority or full manual control when needed. - ESP Metering:
Electro-Selective Pattern metering combined centre-weighted and spot readings for better exposure balance. - Quartz-Timed Electronic Shutter:
Accurate speeds from 2s to 1/2000s, plus 1/60s mechanical backup if batteries fail. - Bright, Clear Viewfinder:
~93% coverage with full information display. - TTL Flash Metering:
Works seamlessly with Olympus T-series flashes. - Motor Drive Compatibility:
Accepts Winder 2 and Motor Drive 1. - Battery Powered:
Requires two SR44 batteries (or equivalent) for full operation. - Robust Build Quality:
A strengthened chassis gave the OM-40 better durability than the OM-10/20 family.
How the OM-40 Stood Apart
| Feature | OM-20 | OM-40 |
|---|---|---|
| Program AE Mode | No | Yes |
| ESP Metering | No | Yes |
| Metering System | Centre-weighted average | Centre-weighted + ESP |
| Shutter Speeds | 2s–1/1000s | 2s–1/2000s |
| Body Strength | Standard alloy | Reinforced |
The OM-40 was the most advanced amateur OM body —
and one of the few OM cameras that truly tried to bring Olympus into the electronic SLR future.
How to Estimate the Age of Your OM-40
| Serial Number Range | Approximate Production Years |
|---|---|
| 100000 – 400000 | OM-40 |
The OM-40 was produced in relatively modest numbers compared to the OM-10,
partly because autofocus SLRs were taking over the market.
Serial Location:
- Engraved on the top plate near the rewind lever.
Olympus OM-40: Full Specifications
| Specification | Detail |
|---|---|
| Year Released | 1985 |
| Shutter Speeds | 2s – 1/2000s (Quartz-timed), 1/60s mechanical backup |
| Flash Sync | 1/60s |
| Metering Modes | ESP (Zone Weighted), Centre-Weighted |
| Exposure Modes | Program AE, Aperture Priority, Manual |
| Viewfinder Coverage | ~93% |
| Motor Drive Compatibility | Winder 2, Motor Drive 1 |
| Batteries | Two 1.5V SR44 or one 3V CR1/3N |
| TTL Flash Support | Yes |
| Body Material | Strengthened composite body |
Final Word
The OM-40 was Olympus’s last serious manual-focus amateur SLR.
And it deserved more love than it got.
Smart, tough, fast — and still giving full control to the photographer when needed.
It arrived at the wrong time:
autofocus had already become the must-have feature, and the OM-40 quietly faded into history.
But today?
It stands tall as one of the best deals in the OM lineup —
a camera that still respects your skills while offering just enough help to let you work faster.
Old enough to have soul.
Smart enough to survive.
Built when cameras were made to last.