Brands Guides About
Rosco Roscolux 1/4 Hamburg Frost Light Diffusing Sheet — main product image
Rosco

Rosco Roscolux 1/4 Hamburg Frost Light Diffusing Sheet

★★★★★5.0 (2 reviews)

Professional-grade 1/4 Hamburg Frost diffusion sheet that softens light while preserving beam control.

$16.00*
✓ In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Roscolux 1/4 Hamburg Frost from Rosco is a professional light diffusing sheet designed to gently soften the output of stage, film, and studio lighting instruments. As a quarter-strength frost, it reduces harsh shadows and specular highlights while allowing the majority of light to pass through with minimal loss. This makes it an ideal choice when you want to take the edge off a hard source without losing punch or creating an overly diffused wash.

What sets Roscolux apart from generic diffusion materials is its tri-extrusion manufacturing process. The diffusion layer is sealed between two microscopically thin layers of clear film, which protects it from the intense heat generated by theatrical lighting instruments. This construction minimizes dye migration and extends the effective lifespan of each sheet significantly. The standard 20" x 24" format is compatible with most professional gel frames and can be quickly trimmed to fit any fixture or modifier in your kit.

Specifications

Brand
Rosco
Product Line
Roscolux
Type
1/4 Hamburg Frost
Sheet Size
20" x 24"
Material
Co-extruded polycarbonate plastic / deep-dyed polyester
Manufacturing
Tri-extrusion technology

Pros & Cons

👍 Pros

  • Tri-extrusion manufacturing extends filter life under high-heat theatrical fixtures.
  • Quarter-strength frost provides subtle softening without significant light loss.
  • Standard 20" x 24" size is easy to cut down and fits most common gel frames.
  • Sealed dye layer minimizes color shifting and dye migration over extended use.
  • Roscolux is an industry-standard brand trusted across film, theater, and photography.

👎 Cons

  • Sold as a single sheet, so multiple units are needed for larger fixtures or productions.
  • The 20" x 24" size may be too small for large softboxes or overhead frames without combining sheets.
  • Quarter frost provides only subtle diffusion, which may not be enough for hard point-source lights.
  • Not reusable indefinitely as prolonged heat exposure will eventually degrade the material.

Frequently Asked Questions

The sheet measures 20 inches by 24 inches, a standard size that can be cut to fit most lighting fixtures and frames.
The 1/4 designation indicates a light level of diffusion that gently softens shadows and reduces harshness without drastically spreading or reducing the light output.
It is manufactured from co-extruded polycarbonate plastic or deep-dyed polyester using Rosco's tri-extrusion technology, which seals the diffusion layer between two thin protective layers.
Yes, the Roscolux tri-extrusion manufacturing process is specifically designed for long life under hot theatrical lights, minimizing dye migration and extending usable life.
Yes, the 20" x 24" sheet can be easily trimmed with scissors or a utility knife to fit specific gel frames, barn doors, or custom light modifiers.

Related Products