Double CTO: Very strong orange color correction gel (approx. +6 Mired) — converts daylight completely to warm tungsten-balanced light.
Definition
The Double CTO is a color conversion filter that reduces the color temperature of light sources by two full Color Temperature Orange steps – from 5600K (daylight) to approximately 2900K (tungsten).
Practical Application
This lighting element is used in various professional scenarios:
- Color Correction: Adapting daylight sources to tungsten lighting setups
- Light Control: Achieving a warmer light mood without changing lamps
- Effect Design: Simulating tungsten light or warm sunlight
- Increased Efficiency: Avoiding color correction in post-production
Technical Details
Important technical features include:
- Density factor: -0.6 to -0.9 f-stops of light loss
- Available as sheet filters or gel filters for various fixtures
- Can be combined with other filters (ND, diffusion)
- Standard sizes: 12"x12", 20"x24", and rolls
Practical Tips
- Factor in an exposure correction of +1 f-stop
- Use heat-resistant variants for HMI lights
- Utilize a light meter for accurate light measurement after filtering
- Protect from direct sunlight and high temperatures
Professional Standards
In professional film and television production, standardized filters enable:
- Consistent color temperature across all light sources
- Quick adjustments without lamp changes
- Reduced post-production costs
- Consistent color rendition according to broadcast standards
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