CTO-052 Color Temperature Orange (Warming) Filter
1/2 CTO colour-conversion filter shifting 5600 K toward 3800 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 3800 K)
- Mired shift: +67 Mired
- Correction strength: 1/2 CTO
- Average transmittance: ~59.9 % T (visible range)
- Peak transmittance: ~96.0 % T near 627 nm
- Minimum transmittance: ~19.1 % T near 481 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-052 delivers a +67 Mired shift to move 5600 K light toward 3800 K. Its smooth spectral slope creates a natural warming effect, with about 59.9 % average visible transmittance and approximately 0.7 stops of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Moderate warming when daylight and tungsten need to blend, especially for interview lighting, event rigs, and warmer skin tones.
Description
CTO-052 delivers a half-CTO shift with a distinctively peaked spectral profile: transmission rises to 96.0 % at 627 nm and holds above 85 % from 599-674 nm, forming a concentrated orange-red passband. Beyond the peak, NIR rolls off to 81.5 % at 800 nm. Blue is suppressed to 20.2 % while violet retains a shoulder at 45.8 %. The focused transmission peak near 630 nm produces a vibrant, saturated warm-orange output rather than a broad warm wash.
Key Advantages
- Peaked passband at 96.0 % centred on 627 nm - concentrates maximum output in the orange-red for vivid, saturated warm colour.
- T > 85 % from 599-674 nm - defines a focused warm band centred on the orange-red spectrum.
- NIR roll-off (81.5 % at 800 nm) - moderates infrared throughput for reduced heat transfer.
- Hard-oxide durability - ion-assisted coating resists 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 concert lighting - produces a punchy, saturated orange wash with reduced NIR heat for extended-use applications.
- Film and television colour effects - delivers a vivid orange-centric warm tone for sunset, firelight, and warm-interior scenes.
- Architectural feature lighting - creates concentrated warm accents that read as vibrant orange rather than diffuse amber.
- Photography warm filtration - adds a strong, focused orange warmth for creative landscape and portrait work.
- Machine vision orange-band imaging - isolates the 600-670 nm band for contrast enhancement in fruit ripeness detection and colour sorting.
Need prototypes in days or production volumes next quarter? CTO-052 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-052 FAQ
What is CTO-052 and what is it used for?
CTO-052 is a Color Temperature Orange Filter - Peaked Orange-Band CTO (T50% = 561 nm). CTO-052 features a peaked orange-band transmission profile with its 50 % crossover at 561 nm and a sharp peak of 91.5 % at 606 nm. The filter holds T > 85 % from 591-633 nm, creating a concentrated warm band in the orange region. Common uses include Stage and theatrical lighting, Film and photography colour effects, Sodium-vapour lamp simulation, and Machine vision orange-band isolation.
What are the key optical specs of CTO-052?
Key published specs for CTO-052 include Colour shift direction: Warming (5600 K → 3200 K); Mired shift: +131 Mired; Correction strength: Full CTO; Average transmittance: ~46.3 % T (visible range); Peak transmittance: ~91.5 % T near 606 nm.
What applications is CTO-052 best suited for?
CTO-052 is commonly used for Stage and theatrical lighting, Film and photography colour effects, Sodium-vapour lamp simulation, and Machine vision orange-band isolation. Stage and theatrical lighting - creates a vibrant orange-band effect for warm scene accents and colour mixing.
Can CTO-052 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-052 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-052?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
