CTO-058 Color Temperature Orange (Warming) Filter
1/8 CTO colour-conversion filter shifting 5600 K toward 5050 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 5050 K)
- Mired shift: +18 Mired
- Correction strength: 1/8 CTO
- Average transmittance: ~72.0 % T (visible range)
- Peak transmittance: ~92.6 % T near 776 nm
- Minimum transmittance: ~51.7 % T near 436 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-058 delivers a +18 Mired shift to move 5600 K light toward 5050 K. Its smooth spectral slope creates a natural warming effect, with about 72.0 % average visible transmittance and less than 0.3 stops of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Very small colour-temperature trims in broadcast, photography, and other colour-critical lighting setups.
Description
CTO-058 is a gentle broadband warming filter with its 70 % transmission crossover at 566 nm. Unlike sharper CTOs, this filter maintains substantial throughput even in the cool bands: violet and blue average 54.3 % and 54.4 % respectively. Transmission rises gradually through green (63.8 %), yellow (72.5 %), and orange (76.8 %) to reach an average of 84.4 % in the red and 91.2 % in the NIR, peaking at 93.2 % at 800 nm. The high baseline and gradual slope produce a subtle, natural warm correction that preserves overall colour balance while gently nudging the output warmer.
Key Advantages
- 70 % crossover at 566 nm with gradual slope - produces the gentlest warm shift in the CTO series, ideal for subtle colour adjustments.
- High minimum transmission (> 51 % across entire range) - preserves substantial throughput even in cool bands, maintaining overall colour balance.
- Peak of 93.2 % at 800 nm - provides strong NIR throughput while keeping warm visible tones well-represented.
- Hard-oxide durability - ion-assisted coating withstands 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 - adds a very subtle warm tint for scenes requiring just a hint of warmth without noticeable colour shift.
- Film and broadcast fine-tuning - provides the lightest available warm correction for colour-temperature trimming between takes.
- Architectural and ambient lighting - gently warms neutral-white sources for spaces that need a barely perceptible warm ambiance.
- Photography neutral-density warming - combines subtle warm correction with light attenuation for creative exposure and colour control.
- Display calibration - provides a reference warm shift for monitor and projector colour-temperature adjustment.
Need prototypes in days or production volumes next quarter? CTO-058 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-058 FAQ
What is CTO-058 and what is it used for?
CTO-058 is a Color Temperature Orange Filter - Gentle Broadband Warm (T70% = 565 nm). CTO-058 is a gentle broadband warming filter with its 70 % transmission crossover at 566 nm. Unlike sharper CTOs, this filter maintains substantial throughput even in the cool bands: violet and blue average 54.3 % and 54.4 % respectively. Common uses include Stage and event lighting, Film and broadcast fine-tuning, Architectural and ambient lighting, and Photography neutral-density warming.
What are the key optical specs of CTO-058?
Key published specs for CTO-058 include Colour shift direction: Warming (5600 K → 5050 K); Mired shift: +18 Mired; Correction strength: 1/8 CTO; Average transmittance: ~72.0 % T (visible range); Peak transmittance: ~92.6 % T near 776 nm.
What applications is CTO-058 best suited for?
CTO-058 is commonly used for Stage and event lighting, Film and broadcast fine-tuning, Architectural and ambient lighting, and Photography neutral-density warming. Stage and event lighting - adds a very subtle warm tint for scenes requiring just a hint of warmth without noticeable colour shift.
Can CTO-058 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-058 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-058?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
