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Hardware GuideSony Help Guide Reference

How to Install & Manage User LUTs on Sony Cameras

Step-by-step instructions for copying, registering, and monitoring custom .cube User LUTs directly in Sony Alpha and Cinema Line cameras, following Sony Help Guide specifications.

Hardware Note

Verify In-Camera User LUT Support Before Proceeding

Not all Sony cameras support in-camera User LUT registration. Bodies with internal User LUT slots (1–16) include: FX3, FX30, FX6, FX9, α7C II, α7CR, α6700, ZV-E1, α7S III (Firmware 3.0+), α9 III, and α1 II.

Cameras like the Sony α7 IV, α7 III, and α6400 do not feature User LUT slots. On the α7 IV, use Gamma Display Assist (Gamma Disp. Assist Typ.) for on-screen monitoring, and apply .cube LUTs during post-production in your NLE (DaVinci Resolve, Premiere Pro, or Final Cut Pro).

1. Memory Card Directory Structure

Sony cameras strictly check specific folder paths on the memory card. The required path depends on whether you are using an SD Card or a CFexpress Type A Card:

SD Cards (SDXC / SDHC)Universal SD Path

Used by α7C II, α7CR, α6700, ZV-E1, and Slot 1/2 of FX3, FX30, α7S III when using SD cards:

/PRIVATE/SONY/PRO/LUT/

Note: On FAT32/exFAT filesystems, case sensitivity is lenient, but Sony Help Guides document uppercase /PRIVATE/SONY/PRO/LUT/.

CFexpress Type A CardsType A Slot

Used on FX3, FX30, α7S III, α9 III, and α1 II when using a CFexpress Type A card:

/SONY/PRO/LUT/

Note: CFexpress cards formatted in Sony cameras omit the /PRIVATE/ root container.

Tip: Always format the memory card in your camera first. This automatically initializes the correct directory hierarchy. If the LUT folder does not exist yet inside PRO, simply create it manually on your computer.

2. File Specifications & 63-Character Naming Rule

Sony cameras have strict hardware parsing requirements for custom LUT files:

  • File Format: 3D Look-Up Table (.cube extension only). 1D LUTs are unsupported.
  • Grid Lattice Dimensions: 33³ (33x33x33 points) or 17³ (17x17x17 points). LUTs with 64³ or 65³ lattices will be rejected or cause import errors.
  • Domain Boundaries: Must be normalized within 0.0 to 1.0.
  • Filename Length (Crucial): Sony Help Guides officially document a maximum of 63 alphanumeric single-byte characters, including the .cube extension (e.g. VeniceWarm_SLog3_v1.cube).
  • Character Set: Use standard ASCII letters (A–Z, a–z), numbers (0–9), underscores (_), and hyphens (-). Avoid special symbols, spaces, or non-ASCII accented characters.
Need to convert a 65³ LUT or bake a Rec.709 film look for Sony S-Log3? Use our LUT → Sony In-Camera Converter to generate a sanitized, compliant 33³ .cube file.

3. In-Camera Menu Navigation & Import Steps

For Sony Alpha Bodies (α7C II, α7CR, α6700, ZV-E1, α7S III, α9 III, α1 II)

  1. Step 1:Insert the memory card containing your .cube files into Slot 1.
  2. Step 2:Press MENU → navigate to Exposure/Color (Magenta icon) → [Color/Tone].
  3. Step 3:Select [Manage User LUTs] → [Import/Edit].
  4. Step 4:Choose an empty slot (User1 through User16).
  5. Step 5:Select your memory card slot, locate your .cube file from the list, and press OK.
  6. Step 6:Confirm the Input Color Space: Set to S-Gamut3.Cine/S-Log3 or S-Gamut3/S-Log3 to match the color science of your LUT.

For Sony Cinema Line (FX3, FX30, FX6, FX9)

  1. Step 1:Insert media into Slot 1.
  2. Step 2:Open MENU → Shooting → [LUT Settings] → [Manage User LUTs].
  3. Step 3:Select an available User slot (User1 – User16) → select [Import] → choose file.
  4. Step 4:In Log Shooting Setting, choose whether the LUT applies to LUT Select (display preview in Cine EI / Flexible ISO) or outputs over HDMI/SDI.

4. Display Preview vs Baked-In Recording (PPLUT)

Depending on your shooting mode, a registered User LUT can be used in two fundamentally different ways:

A. Display Monitoring Only (Log Shooting)

Used in Cine EI, Cine EI Quick, or Flexible ISO modes. The LUT is displayed on your camera LCD, EVF, and HDMI monitor so you can preview the finished look while exposing. The recorded 10-bit video file retains pristine S-Log3 raw data for color grading in post.

B. Baked-In Recording (PPLUT1–PPLUT4)

Available on α7C II, α7CR, α6700, and ZV-E1 via Picture Profile → PPLUT1–PPLUT4. Here, the User LUT is permanently burned into the recorded video file. This delivers ready-to-publish footage directly out of camera without needing color grading in post.

5. Troubleshooting Common Import Errors

Error: "No file found" or Empty List

• Check that the file is in /PRIVATE/SONY/PRO/LUT/ on SD cards, or /SONY/PRO/LUT/ on CFexpress cards.
• Ensure the memory card is inserted in Slot 1.
• Verify the filename does not exceed 63 characters including .cube.

Error: "File format error" / File Rejected

• The LUT is 64³ or 65³ instead of 33³ or 17³. Run it through our LUT → Sony In-Camera Converter.
• The file contains 1D curves or unnormalized negative values out of the 0.0–1.0 bounds. Run it through our LUT Validator.

Why does my A7 IV not show the Manage User LUT menu?

The Sony α7 IV does not have internal User LUT slots on any firmware version. To monitor S-Log3 on an α7 IV, enable Gamma Display Assist (Gamma Disp. Assist Typ. → S-Log3 → 709) under the camera setup menu. Apply your .cube LUTs during post-production in your editing suite.

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