CTO-047 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: ~59.4 % T (visible range)
- Peak transmittance: ~94.6 % T near 644 nm
- Minimum transmittance: ~9.4 % T near 441 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-047 delivers a +67 Mired shift to move 5600 K light toward 3800 K. Its smooth spectral slope creates a natural warming effect, with about 59.4 % 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-047 is a three-quarter CTO variant with its 50 % crossover at 576 nm. The spectral profile closely matches CTO-046 in transition position but delivers a marginally higher red peak of 94.6 % at 644 nm (vs. 758 nm for CTO-046), placing maximum output 100 nm shorter for a warmer visible-band emphasis. Blue averages 19.2 %, green 41.3 %, orange 74.1 %, red 92.0 %, and NIR 91.7 %. The subtle peak-wavelength difference means CTO-047 delivers a slightly more orange-centred warmth compared to the red-NIR emphasis of CTO-046.
Key Advantages
- 50 % crossover at 576 nm with peak at 644 nm - centres maximum output in the orange-red for a visually warmer emphasis than NIR-peaked variants.
- Red and NIR both above 91 % - delivers high efficiency across the full warm-to-NIR range.
- Orange-centred warmth profile - emphasises the visible warm tones over NIR for applications where perceived colour warmth matters most.
- 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 entertainment lighting - creates a three-quarter CTO wash with maximum visual warmth in the orange-red rather than NIR.
- Film and television colour correction - provides intermediate daylight-to-tungsten conversion optimised for on-camera colour perception.
- Architectural and hospitality lighting - delivers a warm ambiance with strong visible warmth that reads as inviting to the human eye.
- Photography golden-hour simulation - adds a rich orange-gold warmth that emphasises sunset-like tones in the visible band.
- LED colour tuning - adjusts cool-white LED output with an orange-centred warm shift for visually appealing CCT reduction.
Need prototypes in days or production volumes next quarter? CTO-047 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-047 FAQ
What is CTO-047 and what is it used for?
CTO-047 is a Color Temperature Orange Filter - Three-Quarter CTO Variant (T50 % = 576 nm). CTO-047 is a three-quarter CTO variant with its 50 % crossover at 576 nm. The spectral profile closely matches CTO-046 in transition position but delivers a marginally higher red peak of 94.6 % at 644 nm (vs. Common uses include Stage and entertainment lighting, Film and television colour correction, Architectural and hospitality lighting, and Photography golden-hour simulation.
What are the key optical specs of CTO-047?
Key published specs for CTO-047 include Colour shift direction: Warming (5600 K → 3800 K); Mired shift: +67 Mired; Correction strength: 1/2 CTO; Average transmittance: ~59.4 % T (visible range); Peak transmittance: ~94.6 % T near 644 nm.
What applications is CTO-047 best suited for?
CTO-047 is commonly used for Stage and entertainment lighting, Film and television colour correction, Architectural and hospitality lighting, and Photography golden-hour simulation. Stage and entertainment lighting - creates a three-quarter CTO wash with maximum visual warmth in the orange-red rather than NIR.
Can CTO-047 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-047 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-047?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
