Global Shutter

Definition

Global Shutter (English: also "Global Exposure" or "True Global Shutter") is an exposure technique where all pixels of a sensor are exposed simultaneously. Unlike Rolling Shutter, where exposure happens line by line, Global Shutter ensures that every pixel of the scene is captured at the exact same moment.

This eliminates all Rolling Shutter artifacts:

• ✓ No Jello effect
• ✓ No skew or shear
• ✓ No aliasing patterns
• ✓ Perfect tracking for VFX

Historical Context

Analog Film (The Original "Global Shutter")

35mm film was de facto Global Shutter:

• Mechanical shutter opens and closes for all frames
• All perforations exposed at the same time
• No temporal offset issues

Digital Evolution

• 2000s: CCD sensors in professional cameras = true Global Shutter (expensive)
• 2010s: CMOS becomes standard, bringing Rolling Shutter with it
• 2024: SONY BURANO = first professional Global Shutter CMOS cinema camera

Problem: Global Shutter CMOS is technologically difficult:

• Requires specialized memory architecture
• Higher heat generation
• Smaller pixel size = less light sensitivity
• Very expensive to develop

Technical Specifications

Global Shutter Implementation

True Global Shutter:
┌─────────────────────────────┐
│ t=0ms: All pixels exposed │
├─────────────────────────────┤
│ t=1-41.67ms: Exposure │
├─────────────────────────────┤
│ t=41.67ms: All pixels │
│ read simultaneously │
└─────────────────────────────┘

Result: Perfectly synchronized, no temporal offsets

SONY BURANO Specifications (2024)

Sensor Format: Super35 (similar to ARRI Alexa)
Resolution: 6K (6144 x 3160)
Global Shutter: ✓ Yes, first cinema camera
Base ISO: 500
Dynamic Range: ~16 stops (RAW)
Frame Rate: 24fps, 25fps, 30fps (Standard)
 60fps (High Frame Rate)
Media: X-OCN RAW (ARRI compatible)
Exposure Time: ~29ms per frame (24fps)
Heat Generation: Significantly higher than CMOS RS
Price: ~€2.8M (Rental: ~€10-15k/day)

Comparison ARRI Alexa 35 (Rolling Shutter):
 Base ISO: 160
 Scan Time: ~10ms (22% of frame)
 Price: €800k-1.2M (Rental: €3-5k/day)
 Heat: Significantly lower

Other Global Shutter Cameras

Professional/Consumer:

Phantom Flex4K (High-Speed):
 - True Global Shutter
 - Specialist for 1000fps+ footage
 - Not for standard 24fps shooting
 - Very expensive and specialized

Sony α9 III / α1 II (Photography):
 - Electronic Global Shutter (not true GS)
 - Video mode only
 - APS-C/Full Frame
 - Much cheaper (~€6-7k)

Panasonic S1H (hybrid):
 - Rolling Shutter, but highly optimized
 - Not true Global Shutter
 - Full Frame

Comparison: Global Shutter vs. Rolling Shutter

Technical Differences

Practical Differences

Scene: Fast 60° pan in 1 second at 24fps

ARRI Alexa 35 (Rolling Shutter):
 - Jello effect clearly visible
 - 2-5° distortion
 - Not ideal for cinematic quality

SONY BURANO (Global Shutter):
 - No distortion
 - Perfectly linear camera movement
 - Cinematic quality in every frame

Practical Applications

1. Action Sequences

Global Shutter is ideal for:

High-Speed Chase Scenes:
 - Fast pursuits on motorcycles/cars
 - Helicopter shots with dynamic movements
 - Quick cuts and transitions
 - Dynamite music videos

Advantage: Every movement remains precise and undistorted

2. VFX and Motion Capture

Motion Capture Studio:
 - Marker-based tracking
 - No Rolling Shutter distortions
 - Perfect 3D reconstruction
 - Higher tracking accuracy

Camera Tracking for VFX:
 - Point-cloud based tracking
 - Without RS artifacts, points can be tracked perfectly
 - Better 3D reconstruction

3. Scientific and Technical Recordings

Ballistic Measurements:
 - High-speed projectiles
 - Fluid dynamics
 - No distortion needed

Remote Sensing / Drones:
 - Satellite-like imagery
 - No Jello effects
 - Geographically precise data

4. Hybrid Productions

Multi-Camera Setups with Global Shutter:
 - Perfect time synchronization between cameras
 - Easier color grading (identical exposure time)
 - More precise VFX compositing

Global Shutter in the Workflow

Pre-Production

Decision: Do I need Global Shutter?

✓ Yes, if:
 - Heavy action sequences
 - Motion capture required
 - Multiple synchronous cameras
 - VFX-heavy production
 - High-speed pans are essential

✗ No, if:
 - Drama with moderate movements
 - Budget-limited
 - Standard camera moves
 - No VFX work

Cost Planning:

Rolling Shutter (ARRI Alexa 35):
 Rental: €3-5k/day
 Lenses: €5-15k for set
 Stabilization: Gimbal (€2-3k/day)

Global Shutter (SONY BURANO):
 Rental: €10-15k/day
 Lenses: €8-20k (new PL-mount options)
 Support Crew: +50% (specialists needed)
 ─────────────────────────────
 Total: 3-4x higher production costs

Shooting

1. Global Shutter enables new creative techniques:

Example Scene: Hero Action Sequence

With Rolling Shutter (ARRI):
 - Moderate camera movements
 - Gimbal-stabilized shots
 - Prepared moves (planned slowly)
 - Post-stabilization in Nuke

With Global Shutter (BURANO):
 - Extreme fast pans
 - Handheld possible (gimbal optional)
 - Spontaneous moves (DoP creativity)
 - No post-stabilization needed

2. LED Compatibility:

Interesting property: Global Shutter is less sensitive
to LED flicker:

Rolling Shutter (ARRI):
 - LED 50Hz flicker visible (depending on scan time)
 - PWM frequency must be high (100+ kHz)

Global Shutter (BURANO):
 - LED flicker less noticeable
 - But PWM LEDs still recommended

Post-Production

Advantage: Significantly less post-production needed

Rolling Shutter Workflow:
 1. Capture Raw/ProRes
 2. Roto/Tracking for stabilization
 3. VFX correction (Nuke/Fusion)
 4. Color grading
 Cost: +30-50% VFX time

Global Shutter Workflow:
 1. Capture Raw/ProRes
 2. Direct to color grading
 3. VFX integration (cleaner)
 4. Final delivery
 Cost: Baseline, no correction needed

Emerging Global Shutter Technologies

Stack-Based Global Shutter CMOS (2024-2026)

Technology: Stacked sensor architecture

Sony:
 - "Stacked CMOS" in FX cameras
 - Memory layer beneath sensor
 - Enables faster readout
 - Result: Minimal Rolling Shutter

SONY BURANO uses this technology:
 - First cinema-grade implementation
 - Full Global Shutter
 - But: extreme heat generation (cooling required)

Projected Global Shutter (2025+)

Upcoming Technologies:

Panasonic S-Series (planned 2025):
 - "Full Global Shutter" mode
 - Hybrid CMOS with specialized memory
 - Cheaper than BURANO

Canon (planned 2026):
 - Possible Global Shutter for Cinema EOS
 - Not yet announced

Global Shutter Challenges

1. Thermal Management

Global Shutter generates a lot of heat:

SONY BURANO Cooling:
 - Active cooling system required
 - Fan runs constantly
 - Places demands on power supply
 - In cold weather: not critical
 - In hot weather: problems possible

2. Pixel Size and ISO

Memory architecture means less space for pixels:

Global Shutter (BURANO):
 Pixel Size: ~5.0µm
 Base ISO: 500 (higher = less light-sensitive)

Rolling Shutter (Alexa 35):
 Pixel Size: ~5.9µm
 Base ISO: 160 (standard)

Practical consequence: BURANO needs ~1-1.5 stops more light

3. Cost

Global Shutter cameras are still very expensive:

Current Market (2024-2025):

ARRI Alexa 35: €800k-1.2M (proven, standard)
SONY BURANO: €2.8M (new, limited supply)

Rental Ratio:
 Alexa 35: ~€3-5k/day
 BURANO: ~€10-15k/day = 3x more expensive

Unaffordable for many productions.

4. Limited Availability

SONY BURANO (2024 Market Situation):
 - Few units worldwide
 - Long rental waiting lists
 - Only available in major production hubs
 - Equipment houses have max. 2-3 units

Result: Cannot be rented without months of planning

Future Outlook

Global Shutter Will Be Standard

Prediction (2025-2030):

2024: Global Shutter is innovation, expensive
2025: 2-3 manufacturers offer GS cameras
2026: Price pressure begins, costs decrease
2028: Global Shutter becomes standard for high-budget
2030: Global Shutter becomes mainstream, costs normalize

Analogous to: Digital cameras 2000-2010 period

Hybrid Global/Rolling Shutter Cameras

Future Development:

Cameras with "Modes":
 - Professional Mode: Global Shutter (higher heat)
 - Efficiency Mode: Rolling Shutter (less power)
 - User chooses based on scene

Technically possible, but not implemented (2024)

Rule of Thumb: When to Choose Global Shutter?

┌──────────────────────────────────────┐
│ Budget │
├──────────────────────────────────────┤
│ < €500k (low) → Rolling Shutter│
│ €500k-2M (medium) → Rolling Shutter│
│ €2-5M (high) → Depending on need │
│ > €5M (blockbuster) → Global Shutter │
│ strongly preferred │
└──────────────────────────────────────┘

┌──────────────────────────────────────┐
│ Project Type │
├──────────────────────────────────────┤
│ Drama → Rolling Shutter│
│ Thriller → Rolling Shutter│
│ Action/Superhero → Global Shutter│
│ VFX-Heavy → Global Shutter│
│ Music Video (Dynamic)→ Global Shutter│
│ Documentary → Rolling Shutter│
└──────────────────────────────────────┘

See Also

• Rolling Shutter – Opposite of Global Shutter
• Shutter Speed – Exposure duration
• SONY BURANO – Global Shutter cinema camera
• ARRI Alexa 35 – Rolling Shutter standard
• Motion Capture – Global Shutter ideal
• VFX Tracking – Global Shutter preferred