CTO-022 Color Temperature Orange (Warming) Filter
Full CTO colour-conversion filter shifting 5600 K toward 3200 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 3200 K)
- Mired shift: +131 Mired
- Correction strength: Full CTO
- Average transmittance: ~47.8 % T (visible range)
- Peak transmittance: ~83.2 % T near 750 nm
- Minimum transmittance: ~12.7 % T near 479 nm
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Intermediate Mired shifts, combined CTO+diffusion, custom sizes, rapid prototypes
Learn more
CTO-022 delivers a +131 Mired shift to move 5600 K light toward 3200 K. Its smooth spectral slope creates a natural warming effect, with about 47.8 % average visible transmittance and approximately 1.5 stops of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Full daylight-to-tungsten conversion on HMI or daylight LED fixtures, mixed-light interiors, and scenes that need a strong warm match.
Description
CTO-022 is a deep color-temperature-orange filter with its 50 % crossover at 594 nm, closely matching the sodium-D line. The blue band is suppressed to an average of 13.5 %, and green averages 22.9 %, creating a firmly warm spectral profile. Transmission rises through yellow (43.3 %) and orange (54.4 %) to reach an average of 70.1 % in the red band. Peak transmission of 83.2 % at 750 nm places maximum throughput in the far red and NIR. The profile is very similar in depth to CTO-021 but carries slightly more red-channel energy, making it marginally warmer and more vivid in the deep red.
Key Advantages
- 50 % crossover at 594 nm - delivers a deep warm shift with the crossover aligned to the sodium emission region.
- Strong cool-tone rejection (blue avg 13.5 %, green avg 22.9 %) - produces a convincingly warm output with minimal residual blue.
- Peak transmission of 83.2 % at 750 nm - maintains efficient throughput in the far red and NIR bands.
- Hard-oxide durability - ion-assisted coating withstands high lamp heat, humidity, solvents, and cleaning.
- Custom formats available - round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates.
Typical Applications
- Stage and theatrical lighting - creates deep amber and golden washes for sunset, candlelight, and warm-interior scene design.
- Film and broadcast colour correction - provides a strong daylight-to-tungsten conversion for consistent warm-tone matching across mixed lighting setups.
- Architectural feature lighting - transforms cool-white sources into rich warm accents for facades, columns, and monument illumination.
- Sodium-line optical work - the crossover near 589 nm positions this filter at the boundary of sodium emission, useful for sodium-lamp simulation or rejection studies.
- Machine vision spectral shaping - emphasises red and NIR illumination while suppressing shorter wavelengths for high-contrast material inspection.
Need prototypes in days or production volumes next quarter? CTO-022 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-022 FAQ
What is CTO-022 and what is it used for?
CTO-022 is a Color Temperature Orange Filter - Deep Warm Shift (T50 % = 594 nm). CTO-022 is a deep color-temperature-orange filter with its 50 % crossover at 594 nm, closely matching the sodium-D line. The blue band is suppressed to an average of 13.5 %, and green averages 22.9 %, creating a firmly warm spectral profile. Common uses include Stage and theatrical lighting, Film and broadcast colour correction, Architectural feature lighting, and Sodium-line optical work.
What are the key optical specs of CTO-022?
Key published specs for CTO-022 include Colour shift direction: Warming (5600 K → 3200 K); Mired shift: +131 Mired; Correction strength: Full CTO; Average transmittance: ~47.8 % T (visible range); Peak transmittance: ~83.2 % T near 750 nm.
What applications is CTO-022 best suited for?
CTO-022 is commonly used for Stage and theatrical lighting, Film and broadcast colour correction, Architectural feature lighting, and Sodium-line optical work. Stage and theatrical lighting - creates deep amber and golden washes for sunset, candlelight, and warm-interior scene design.
Can CTO-022 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-022 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Intermediate Mired shifts, combined CTO+diffusion, custom sizes, rapid prototypes. Custom formats available - round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates.
What should I know about angle of incidence and durability for CTO-022?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
