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Rectangular translucent gel filter sheet, 24 by 21 inches, matte finish

Lee Filters

Lee Filters 3/4 Tough Spun FR Flame Retardant Gel Filter Sheet 24x21 in

SKU CH-AZSS-HCPEH

Flame-retardant diffusion sheet softens harsh studio light across a 24 by 21 inch surface for safer, natural illumination

  • Softens harsh light for natural illumination with 3/4 Tough Spun diffusion
  • Flame-retardant material meets safety standards for high-temperature studio use
  • Generous 24x21 inch sheet covers a wide range of lighting setups
  • Durable Tough Spun construction withstands frequent handling over time
  • Suitable for stage, film and photography lighting applications

24x21 Inch Diffusion Sheet

The Lee Filters 3/4 Tough Spun FR is a flame-retardant gel filter sheet measuring 24 by 21 inches. It softens harsh light sources to reduce contrast and create natural, flattering illumination for professional photography, film, and stage lighting setups. The durable Tough Spun construction withstands frequent handling while maintaining consistent diffusion properties over time.

Studios Needing Safe Diffusion

This sheet suits photographers and gaffers who require a large, durable diffusion material that meets flame-retardant safety standards for hot studio environments. It is not intended for buyers who need coloured lighting effects or heavy colour correction gels, as this product provides neutral white diffusion only. Users requiring smaller pre-cut filter sizes or rigid diffusion panels should consider alternative formats.

Flame Retardant Gel Material

The bundled material is a single sheet of flame-retardant Tough Spun gel designed to withstand high temperatures from continuous lighting fixtures. Its heat-resistant composition allows safe placement close to hot light sources without melting or burning, a critical safety feature for extended studio sessions. The gel format enables custom cutting to fit specific barn doors, frames, or softbox configurations.

Highlights

  • Softens harsh light for natural illumination with 3/4 Tough Spun diffusion
  • Flame-retardant material meets safety standards for high-temperature studio use
  • Generous 24x21 inch sheet covers a wide range of lighting setups
  • Durable Tough Spun construction withstands frequent handling over time
  • Suitable for stage, film and photography lighting applications

Specifications

No published specifications for this item yet.

Questions about this item

What size lighting frame or fixture do I need to hold this 24x21 inch sheet?

The sheet measures 24 by 21 inches, so it fits frames or fixtures designed for that exact size or can be trimmed to suit smaller holders.

Will the flame-retardant material withstand the heat from my tungsten or HMI heads?

Yes, the FR coating is engineered for high-temperature studio and stage environments, letting it sit close to hot lamps without igniting.

How can I confirm the diffusion strength is the 3/4 stop I expect once it is rigged?

Meter the light with and without the sheet in place; a drop of roughly three-quarters of a stop confirms the rated diffusion level.

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