The classic Photo-Sonics high-speed film camera – 35mm at up to 360 fps. With rotating prism compensator, the 4C became the Hollywood standard for film slow-motion.
What is the Photo-Sonics 4C?
The Photo-Sonic 4C is a 35mm film high-speed camera from the 1980s. With up to 360 frames per second on real film stock, it was the Hollywood standard for slow-motion for decades – from explosions to stunts.
Technical Specifications
| Feature | Value |
|---|---|
| Format | 35mm (4-perf) |
| Max. fps | 360 |
| Min. fps | 50 |
| Transport | Continuous |
| Compensation | Rotating Prism |
| Viewfinder | Non-reflex |
| Magazine | 120m / 300m |
| Weight | ~15 kg |
Frame Rates
| Setting | fps | Slow-Down (at 24) |
|---|---|---|
| Minimum | 50 | 2× |
| Standard | 120 | 5× |
| Maximum | 360 | 15× |
The Rotating Prism Principle
Why Continuous Transport?
With intermittent transport (like normal cameras):
- Film stops, exposes, moves
- At 360 fps: 360 starts/stops per second
- Mechanical stress would destroy film
The 4C Solution
CONVENTIONAL: PHOTO-SONICS 4C:
Film stops → Exposure Film runs continuously
Film moves → Dark phase Prism compensates for movement
→ Image "floats" with the filmThe rotating prism optically compensates for film movement – the image remains stationary during exposure.
4C vs. 4E
| Feature | 4C | 4E |
|---|---|---|
| Max. fps | 360 | 360 |
| Viewfinder | Non-reflex | Non-reflex (4ER: Reflex) |
| Generation | Older | Newer |
| Mechanics | Proven | Improved |
| Availability | Limited | Slightly better |
Film Consumption
At 360 fps
| Time | Film Consumed | Rolls (300m) |
|---|---|---|
| 1 Sec. | 5.5 m | 0.02 |
| 10 Sec. | 55 m | 0.18 |
| 1 Min. | 330 m | 1.1 |
| 5 Min. | 1,650 m | 5.5 |
Cost Calculation (90s)
| Item | Per 10 Sec. |
|---|---|
| Film Stock | ~€150 |
| Processing | ~€100 |
| Telecine/Scan | ~€200 |
| Total | ~€450 |
Typical Applications
Film Productions
| Application | Typical fps |
|---|---|
| Explosions | 300–360 |
| Glass Breakage | 360 |
| Water Splashes | 200–300 |
| Stunts | 120–200 |
| Pyrotechnics | 300–360 |
Commercials
| Product | Application |
|---|---|
| Automobiles | Crash Tests |
| Beverages | Splashes |
| Cosmetics | Hair Movement |
| Sports | Action |
Notable Films
| Film | Year | Sequence |
|---|---|---|
| Die Hard | 1988 | Explosions |
| Terminator 2 | 1991 | Truck Crash |
| Lethal Weapon 3 | 1992 | Stunts |
| True Lies | 1994 | Harrier Sequence |
| Speed | 1994 | Bus Explosion |
Camera Setup
Standard Configuration
| Component | Details |
|---|---|
| Body | 4C |
| Magazine | 300m (1,000 ft) |
| Lens | Specialized High-Speed Lenses |
| Mount | Mitchell (adaptable) |
| Tripod | Heavy-duty industrial tripod |
Lighting Requirements
| fps | Required Aperture (at ASA 500) |
|---|---|
| 120 | f/4 in strong daylight |
| 240 | f/2.8 in strong daylight |
| 360 | f/2 or more light |
Problem: At 360 fps, the exposure time is ~1/720 second – extreme light required.
The Workflow
Pre-Production
- Precise fps planning
- Light calculation
- Film stock order
- Backup material
On Set
- Camera alignment (non-reflex!)
- Video assist for framing
- Test exposure
- Recording
- Immediate magazine change
Post-Production
- Processing
- Telecine/Scan
- Conformity with remaining material
Limitations
| Aspect | Challenge |
|---|---|
| Non-reflex | Framing blind |
| Light Demand | Enormous |
| Cost | Very high |
| Noise | Loud |
| Setup Time | Long |
The Legacy
For High-Speed Cinematography
- Defined the standard
- Proved: 35mm at 360 fps is possible
- Foundation for digital development
The Look
The characteristic 35mm film look at high speed – with fine grain and organic colors – is still not fully reproducible digitally today.
Today
| Aspect | Details |
|---|---|
| Status | Museum/Specialists |
| Availability | Very rare |
| Replaced by | Phantom Digital |
| Collector Value | Historically significant |
Why Still Relevant?
For film purists and authentic period productions, the 4C remains the reference system for true film high-speed.