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Sony FX6: Camera Technical Guide

Definitive technical guide to master the Sony Cinema Line FX6: Cinema EI mode, ETTR exposure in S-Log3, advanced autofocus, and workflows for documentary, advertising, and fiction.

The Sony FX6 is the compact Cinema Line camera with backlit Full Frame sensor (A7S III) and VENICE color science. In 890 g it delivers 15+ stops, dual base ISO 800/12800, electronic variable ND, XLR and 3G SDI. The reference for documentary, advertising, fiction, corporate, and agile broadcast, with Netflix-approved workflow. This guide covers real-world settings, workflows, tips, and on-set troubleshooting.

Carlos F. Tejada
Carlos F. Tejada
CEO Producción audiovisual
Actualizado: 04/08/2026 17503
Sony FX6: Camera Technical Guide
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Sony FX6 Guide: PXW-FX6 Configuration Manual

1. Key Technical Specifications

  • Sensor: Full Frame 35mm Exmor R CMOS (10.2 MP), low rolling shutter
  • Dual Base ISO: 800 and 12800, 15+ stops at both
  • Codecs: XAVC-I (240-600 Mbps), XAVC-L (50-100 Mbps), MPEG HD, proxies
  • Framerates: 4K up to 120p (S&Q), FHD up to 240p, RAW 4K 16-bit 60p via HDMI
  • Electronic variable ND: 1/4-1/128 (2-7 stops, 0.6-2.1) with Auto ND
  • Connectivity: 3G-SDI, HDMI-A, 2× XLR, BNC timecode, MI-shoe digital
  • Power: BP-U (U35/U60/U100), 12V DC, hot-swap V-Mount

2. Initial Camera Setup

Fundamental Recording Settings

  • Format: XAVC-I 4K 4:2:2 10-bit (chroma key, VFX and aggressive grading)
  • Frame Rate: 25p PAL, 24p cinema, 50p/60p slow motion
  • Shutter: 180° (1/50 at 25p, 1/48 at 24p)
  • WB: 3200/5600 K presets + custom with grey card
  • Audio: XLR CH1/CH2 -20 dBFS ref, limiter ON, 48V phantom if applicable

Customizable Buttons (C1-C4 and Assign)

  • C1: Picture Profile (PP9 S-Log3 ↔ PP10 HLG3)
  • C2: Clear Image Zoom (up to 1.5×)
  • C3: Peaking Focus (medium, red)
  • C4: Zebra 1 at 70% + Zebra 2 at 94%
  • Assign 7: False Color for S-Log3

3. Cine EI vs Flexible ISO Mode

Cine EI: How It Works

In Cine EI you work at one of the native ISOs (800/12800). The EI dial does not alter the recorded signal: it changes monitor brightness/LUT to simulate the final look. You expose at an EI (400 or 1600) but the file maintains the native ISO, preserving dynamic range.

Cine EI Advantages:

  • Maximum dynamic range (15+ stops guaranteed)
  • Consistent exposure between takes (critical for VFX and matching)
  • Monitoring LUTs without affecting recorded file
  • Compatible with VENICE, FX9, BURANO

Cine EI Workflow Step by Step

  • 1. Project → Base Setting → Shooting Mode: Cine EI
  • 2. Base ISO (800 daylight, 12800 night)
  • 3. Load Monitor LUT (s709 or DOP's) on SDI/HDMI
  • 4. EI: lowering (400) overexposes negative, raising (1600) underexposes
  • 5. Expose viewing LUT and verify with waveform + false color
  • 6. Note EI on camera report for colorist

Flexible ISO Mode

Adjust ISO 800-409600 in S-Log3. Ideal for documentary with changing light, live coverage, run-and-gun and low light. Raising ISO sacrifices highlights; lowering it, shadows.

4. S-Log3, Exposure and Color Profiles

S-Log3 with S-Gamut3.Cine captures 15+ stops. The FX6 adds HLG3 (HDR without grading) and S-Cinetone (cinema look direct, VENICE-like skin tones).

PP9 Configuration (S-Log3 / S-Gamut3.Cine)

  • Gamma: S-Log3
  • Color Mode: S-Gamut3.Cine
  • Black Level: 0
  • Knee: Manual, 95%, slope 0
  • Detail Level: -7

ETTR Exposure and IRE Reference Table

Underexposing S-Log3 produces noise and banding. Apply ETTR by overexposing 1-2 stops and compensate in post. Waveform reference:

ElementIRE (%)Notes
Caucasian skin 41-43% Broadcast reference
Latino skin 38-41% Adjust for pigmentation
Dark skin 32-38% Don't underexpose, preserve detail
18% grey 41% S-Log3 middle grey
90% white 61% 33% margin
Clear sky 55-62% Avoid clipping
Cloudy sky 50-55% Stable reference
Golden hour 45-70% Prioritize highlights
Shadows 18-25% Never below 15%
Specular whites 78-85% Reflections and water

Zebra, False Color and Post

Zebra 1 at 70% ±5% for skin tones and Zebra 2 at 94% as clip alert. False Color: green = middle grey, pink = skin, red/yellow = clipping. In DaVinci Resolve import in S-Gamut3.Cine / S-Log3, apply CST or technical LUT to Rec.709 (or Rec.2020 PQ for HDR) and do primary/secondary in the next node. Never apply double transformation. Check the complete Sony FX6 technical datasheet.

5. Advanced Fast Hybrid Autofocus

Fast Hybrid AF with 627 phase-detection points (89% of sensor) + contrast detection. Includes Real-time Eye AF, face recognition and touch tracking.

  • Continuous AF + Face/Eye Priority: interviews and documentary
  • AF Transition Speed: 3-4 out of 7 (cinematic rack focus)
  • Subject Shift Sensitivity: 2-3 (avoid jumps)
  • AF Area: Wide for action, Flexible Spot S for portrait
  • Touch Tracking: touch subject on LCD to lock
  • MF Assist: Red peaking + 4×/8× focus magnifier for cinema lenses

Use MF with PL/cinema lenses or when background confuses AF. The FX6 does not have IBIS: use OSS, Active SteadyShot (crops ~10%) or gimbal. Don't combine Active SteadyShot with anamorphics.

6. Workflows by Production Type

Documentary and Reportage

Flexible ISO, S-Log3 PP9, continuous AF Face Priority, Auto ND, XAVC-L 4K 50 Mbps. Shotgun on MI-shoe and XLR ambient + lavalier.

Advertising and Commercials

Cine EI ISO 800, Rec.709 LUT, XAVC-I 4K 4:2:2 10-bit, manual follow focus, DIT monitor via SDI. Jam sync and grey card per setup.

Fiction and Short Film

Cine EI according to light, external monitor with DOP's LUT, electronic slate, 16-bit HDMI RAW to Atomos for maximum latitude. Cinema lenses, mechanical follow focus, matte box.

Corporate and Events

Flexible ISO, HLG3 or S-Cinetone without grading, continuous AF, XAVC-L, SDI to switcher, embedded audio with LTC.

Multicam and Synchronization

BNC Timecode with Tentacle Sync or Ambient Lockit as master. Same PP, temperature and base ISO on all cameras. Shared slate and consistent scene/take accelerate sync.

7. Media Management and File Structure

The FX6 uses CFexpress Type A (mandatory for XAVC-I 4K 60p/120p) or SD UHS-II V60/V90. Recommended: Sony Tough CEA-G160T/G80T (VPG400) and ProGrade Cobalt. Dual slot in relay or simultaneous mode.

Always format in camera and apply the 3-2-1 rule: 3 copies, 2 media types, 1 off-site. Structure M4ROOT/ with Clip/ (MP4/MXF), Sub/ (proxies) and General/ (XML). Copy M4ROOT entirely: XMLs reconstruct metadata in NLE.

On-set backup workflow:

  • Remove card with LED off and take to DIT with protected case
  • Clone 1 to portable SSD (SanDisk Extreme PRO, Samsung T7)
  • Clone 2 to RAID 1 or NAS (Synology, QNAP)
  • Verify checksums (MD5/xxHash) before formatting card
  • Cloud backup (LucidLink, Frame.io, Dropbox) via 5G/WiFi 6 when available

8. Post-Production in DaVinci Resolve

Project Setup and Color Management

  • Timeline: 3840×2160 25p (PAL) or 24p (cinema)
  • Color Management: DaVinci YRGB Color Managed
  • Input Color Space: S-Gamut3.Cine / S-Log3
  • Timeline Color Space: Rec.709-A Gamma 2.4 (SDR) or Rec.2020 ST.2084 PQ 1000 nits (HDR)
  • Output Color Space: same as timeline or Rec.709 Gamma 2.4 for delivery

Node Structure and LUTs

  • Node 1: Technical LUT (Sony_SLog3_SGamut3Cine_to_LC709typeA.cube) or CST to Rec.709
  • Node 2: Color balance (Lift/Gamma/Gain, temperature, tint)
  • Node 3: Contrast curves and saturation
  • Node 4: Secondary corrections (HSL qualifier, Power Windows)
  • Node 5: Creative LUT or look (optional)
  • Node 6: Sharpening and grain (if applicable)

Download Sony's official LUTs from Catalyst Browse or pro.sony. Common LUTs: LC-709TypeA (Rec.709 neutral), 709(800) (for ISO 800 footage), Venice CS (cinematic). Never stack multiple conversion LUTs.

Export and Deliverables

  • Master: ProRes 422 HQ 4K or DNxHR HQX
  • Broadcast: XAVC-I 4K 300 Mbps or IMF
  • Web/social: H.264 4K 20-40 Mbps or H.265 (HEVC) 15-30 Mbps
  • HDR: Rec.2020 PQ or HLG, 10-bit minimum
  • Review: H.264 1080p 10 Mbps with burned-in timecode

9. Troubleshooting and On-Set Tips

Common Issues and Solutions

  • Banding in shadows: Never underexpose below 18% IRE in S-Log3. Apply ETTR and use noise reduction in post if necessary
  • Pink/green skin tones: Verify WB with grey card. In post, adjust Hue vs Sat on skin qualifier
  • AF hunting: Reduce Subject Shift Sensitivity to 2, use Touch Tracking or switch to MF
  • SDI no signal: Check HDMI/SDI output assignment in menu. Enable 4K output if applicable
  • Overheating: Avoid direct sunlight on body, enable High Temp. Warning, use sunshade and active cooling
  • Rolling shutter with fast pans: Reduce pan speed or use faster shutter (1/100, 1/200) if motion blur is acceptable
  • Card error: Reformat card in camera. If persistent, replace card and contact manufacturer
  • Flickering under LED/fluorescent: Enable Flicker Reduce Shooting at 50 Hz (Europe) or 60 Hz (Americas)

Pre-Production Checklist

  • ✓ Firmware updated to latest version (check pro.sony)
  • ✓ Cards formatted and tested (write speed benchmark)
  • ✓ Batteries charged and cycle count verified
  • ✓ Picture Profile saved and loaded (PP9, PP10, custom)
  • ✓ Custom buttons assigned per workflow
  • ✓ Monitor LUTs loaded on SDI/HDMI output
  • ✓ Timecode sync tested (if multicam)
  • ✓ Lens metadata communication verified (Sony E-mount)
  • ✓ Audio levels calibrated (-20 dBFS tone)
  • ✓ Camera report template prepared with EI/ISO, PP, LUT notes

Battery Life Optimization

BP-U70 delivers ~90-120 min continuous recording in 4K 25p. Extend runtime:

  • Reduce LCD brightness to 50-60%
  • Disable WiFi/Bluetooth when not in use
  • Minimize SDI/HDMI output if external monitor not critical
  • Use V-Mount battery with hot-swap plate for extended shoots
  • Keep spare BP-U batteries warm in cold conditions (under 10°C/50°F)
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