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Rosco Cinegel Quarter Blue Lighting Filter 48
Rosco

Rosco Cinegel Quarter Blue Lighting Filter 48"x25' Roll

Precisely shift tungsten lighting toward daylight with Rosco's Cinegel Quarter Blue filter in a generous 48"x25' roll.

$199.75*
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Rosco Cinegel Quarter Blue (1/4 CTB) is a color correction filter designed for professionals who need precise, subtle adjustments to tungsten lighting. With a mired shift of -30, it raises the color temperature of a standard 3200°K tungsten source to approximately 3500°K — just enough to compensate for voltage drops on dimmed fixtures or to nudge warm light slightly cooler when working in mixed lighting environments. At 74% transmission, it absorbs less than half a stop of light, making it one of the more efficient correction filters to work with.

Supplied as a 48-inch by 25-foot roll, this format gives lighting departments plenty of material to cut custom pieces for a variety of fixtures, from compact fresnels to large softbox frames and window gels. Rosco's Cinegel line has long been an industry standard in film, television, and theatre production, known for consistent color accuracy and reliable performance under the heat of professional instruments. For crews that need a slight cool push without the dramatic shift of a full or half CTB, the Quarter Blue fills that niche precisely.

Key Features

ENHANCED COLOR ACCURACY - Rosco Cinegel Quarter Blue (1/4 CTB) ensures precise color correction, maintaining true-to-life hues in your photography and videography projects.

SUPERIOR LIGHT TRANSMISSION - Experience minimal light loss with this filter, preserving brightness and allowing for efficient use of your lighting equipment for optimal results.

INCREASED DURABILITY - Crafted to withstand demanding conditions, this Rosco filter resists tearing and fading, ensuring long-lasting performance in various shooting environments.

EXCELLENT HEAT RESISTANCE - Designed to endure high temperatures from studio lights, preventing warping or discoloration, maintaining consistent color and quality over extended use.

CONVENIENT SIZE - The 48" x 25' roll offers ample material for multiple setups, easily cut and applied to various light sources, providing versatility for diverse creative needs.

Specifications

Brand
Rosco
Product
Cinegel Quarter Blue (1/4 CTB)
Size
48" x 25' Roll
Usage
Color Correction for Lighting
Mired Shift
-30
Transmission
74% (-0.4 stops)

Pros & Cons

👍 Pros

  • Generous 48"x25' roll provides ample material for multiple productions and fixture sizes
  • 74% transmission preserves most of the fixture's light output with only a -0.4 stop loss
  • Subtle -30 mired shift allows fine color tuning without drastically altering the scene's warmth
  • Rosco's Cinegel line is an industry standard trusted by professional gaffers and DPs
  • Easy to cut to custom sizes for different fixtures and rigging setups

👎 Cons

  • Quarter Blue provides only a subtle shift, requiring multiple layers or a stronger filter for full CTB correction
  • Large roll size may be more material than needed for small or single-fixture setups
  • Gel material can degrade and fade over extended use with high-heat fixtures, requiring replacement
  • Not self-adhesive, so separate clips or tape are needed to secure it to fixtures or frames

Frequently Asked Questions

It applies a mired shift of -30, raising 3200°K tungsten sources to approximately 3500°K — a subtle correction rather than a full tungsten-to-daylight conversion.
The Cinegel Quarter Blue has a 74% transmission rate (-0.4 stops), so you lose less than half a stop of light output.
The roll measures 48 inches wide by 25 feet long, allowing you to cut custom sheets for fresnels, softboxes, or window frames as needed on set.
A 1/4 CTB is ideal when you need a slight cool correction — such as compensating for voltage drop on dimmered tungsten fixtures or blending tungsten slightly closer to mixed lighting conditions without going full daylight.
Rosco Cinegel filters are manufactured for use with professional lighting instruments, including hot tungsten fixtures, and are designed to handle the associated operating temperatures.

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