Camerastuff Gel Colour Filter Sheet 1/2 CTB 80x100cm 0.055mm

The 1/2 CTB gel provides a moderate blue shift, adjusting tungsten lighting from 3200K to around 4300K. It’s useful when you want to cool down a warm source without going full daylight, or when you're aiming for a cooler tone in your scene. Measuring 80x100cm and 0.0055mm thick, this gel is lightweight, flexible, and easy to use on softboxes, barn doors, or bare bulbs. A solid choice for balancing mixed lighting or creating a cooler mood in portraits or video work.

Key Features

• High light transmission PET (Polyethylene Terephthalate) material
• Lightweight design with steady colour temperature and minimal light loss
• Perfect for creating different effects with photo studio strobe flash and LED lights
• Enables both additive and subtractive colour mixing techniques
• Controls absorption and filtering of different wavelengths of light
• Available in multiple colours for various creative applications

Technical Specifications

• Model: Lighting Gel Filter 80x100cm
• Size: 80x100cm 
• Thickness: 0.05mm version
• Material: PET (Polyethylene Terephthalate)

What's Included

• 1 x 1/2 CTB Single Sheet 80x100cm

Important Notes

• Colour appearance may vary slightly due to individual monitor calibration
• Please allow for minor measurement deviations due to manual measurement

CTB vs CTO Gels

CTO (Colour Temperature Orange) gels are used to warm up daylight-balanced light sources (around 5600K) so they match the warmer hue of tungsten lighting (approximately 3200K). These gels are typically placed over flashes, LEDs, or other daylight-balanced lights when shooting indoors, helping to create a consistent colour temperature across the scene. CTO gels come in varying strengths—full, half, and quarter—to fine-tune the warmth depending on the desired effect or mix of light sources.

CTB (Colour Temperature Blue) gels do the opposite: they cool down tungsten-balanced lights to match daylight. This is useful when using tungsten lights in a setting with natural daylight or daylight-balanced fixtures, ensuring everything blends seamlessly. Like CTOs, CTBs also come in different intensities (full, half, and quarter), allowing for flexibility in colour balancing depending on how much of

Practical Applications – CTB Gels

• Full CTB (1/1): Use when you need to convert a tungsten-balanced light (around 3200K) to daylight (approximately 5600K). Common in situations where you’re using warm lights indoors but want to match them to daylight or daylight-balanced gear.
• 1/2 CTB: Ideal for situations where you want to cool down a warm light slightly without going full daylight. Useful for mimicking early morning or overcast daylight conditions indoors.
• 1/4 CTB: Perfect for subtly reducing the warmth of a tungsten source without losing that cosy feel. Handy for evening shots where you want cooler tones without fully shifting the mood.
• 1/8 CTB: Best when you need just a touch of coolness, maybe to take the orange edge off a tungsten lamp or add a slight crispness to a warm source without dramatically changing the look.