CTO-057 Color Temperature Orange (Warming) Filter
3/4 CTO colour-conversion filter shifting 5600 K toward 3400 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 3400 K)
- Mired shift: +100 Mired
- Correction strength: 3/4 CTO
- Average transmittance: ~53.1 % T (visible range)
- Peak transmittance: ~95.1 % T near 753 nm
- Minimum transmittance: ~14.3 % T near 398 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-057 delivers a +100 Mired shift to move 5600 K light toward 3400 K. Its smooth spectral slope creates a natural warming effect, with about 53.1 % average visible transmittance and a low amount of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Strong but not full warming when you want a natural blend between daylight and tungsten sources.
Description
CTO-057 delivers a clean three-quarter CTO conversion with its 50 % crossover at 584 nm and a smooth, monotonically rising profile. Violet and blue are well-suppressed at 15.7 % and 15.9 % respectively, while transmission climbs steadily through yellow (46.2 %), orange (71.5 %), and red (91.0 %) to peak at 95.1 % at 753 nm. NIR averages 94.2 %. The absence of spectral notches, shoulders, or anomalies makes CTO-057 one of the cleanest, most predictable CTOs in the series.
Key Advantages
- Clean, monotonic 50 % crossover at 584 nm - produces the smoothest three-quarter CTO profile in the series with no spectral artefacts.
- Peak of 95.1 % at 753 nm with NIR avg 94.2 % - delivers outstanding long-wavelength efficiency.
- Balanced blue suppression (violet and blue both < 16 %) - provides even cool-tone rejection for a natural-looking warm shift.
- 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 event lighting - provides the reference three-quarter CTO conversion with predictable, artefact-free colour behaviour.
- Film and broadcast colour correction - delivers reliable three-quarter CTO for precise colour-temperature matching in professional production.
- Architectural and commercial lighting - shifts cool-white LED sources toward warm ambiance with calibrated precision.
- Photography and colour grading - provides a clean physical warm filter for in-camera use with predictable colour shift.
- LED fixture permanent colour correction - replaces disposable gel sheets with a durable hard-coated filter for long-term warm conversion.
Need prototypes in days or production volumes next quarter? CTO-057 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-057 FAQ
What is CTO-057 and what is it used for?
CTO-057 is a Color Temperature Orange Filter - Clean Three-Quarter CTO (T50% = 584 nm). CTO-057 delivers a clean three-quarter CTO conversion with its 50 % crossover at 584 nm and a smooth, monotonically rising profile. Violet and blue are well-suppressed at 15.7 % and 15.9 % respectively, while transmission climbs steadily through yellow (46.2 %), orange (71.5 %), and red (91.0 %) to peak at 95.1 % at 753 nm. Common uses include Stage and event lighting, Film and broadcast colour correction, Architectural and commercial lighting, and Photography and colour grading.
What are the key optical specs of CTO-057?
Key published specs for CTO-057 include Colour shift direction: Warming (5600 K → 3400 K); Mired shift: +100 Mired; Correction strength: 3/4 CTO; Average transmittance: ~53.1 % T (visible range); Peak transmittance: ~95.1 % T near 753 nm.
What applications is CTO-057 best suited for?
CTO-057 is commonly used for Stage and event lighting, Film and broadcast colour correction, Architectural and commercial lighting, and Photography and colour grading. Stage and event lighting - provides the reference three-quarter CTO conversion with predictable, artefact-free colour behaviour.
Can CTO-057 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-057 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-057?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
