CTO-059 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: ~75.9 % T (visible range)
- Peak transmittance: ~90.7 % T near 777 nm
- Minimum transmittance: ~59.9 % T near 435 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-059 delivers a +18 Mired shift to move 5600 K light toward 5050 K. Its smooth spectral slope creates a natural warming effect, with about 75.9 % 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-059 is the subtlest warming filter in the entire CTO series, with its 70 % crossover at 528 nm and minimum transmission never dropping below 59.9 %. The spectral slope is remarkably gentle: violet averages 61.5 %, blue 62.7 %, green 70.6 %, yellow 77.3 %, orange 80.3 %, red 85.3 %, and NIR 89.7 %, peaking at 90.9 % at 800 nm. This near-neutral density filter with a warm bias barely alters the visible colour balance, adding only the faintest golden warmth.
Key Advantages
- Ultra-subtle warm shift with minimum T > 59.9 % - produces the lightest colour-temperature correction in the CTO series while maintaining high throughput.
- 70 % crossover at 528 nm - places the gentle transition in the green band for a barely perceptible warm bias.
- Near-flat spectral profile - adds warmth without significantly distorting the source colour balance.
- 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 television lighting - provides the gentlest possible warm correction for fine-tuning colour temperature without visible colour shift.
- Film and broadcast micro-adjustment - enables extremely fine colour-temperature trimming for colour-critical production environments.
- Photography neutral-warm correction - adds the faintest warm tint for correcting slightly cool ambient lighting conditions.
- Optical system colour trimming - provides a calibrated minimal warm shift for compensating slight blue bias in lenses or optical coatings.
- Display and projection fine-tuning - corrects very slight cool-colour bias in projection and display systems without noticeable colour impact.
Need prototypes in days or production volumes next quarter? CTO-059 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-059 FAQ
What is CTO-059 and what is it used for?
CTO-059 is a Color Temperature Orange Filter - Ultra-Subtle Warm Tint (T70% = 528 nm). CTO-059 is the subtlest warming filter in the entire CTO series, with its 70 % crossover at 528 nm and minimum transmission never dropping below 59.9 %. The spectral slope is remarkably gentle: violet averages 61.5 %, blue 62.7 %, green 70.6 %, yellow 77.3 %, orange 80.3 %, red 85.3 %, and NIR 89.7 %, peaking at 90.9 % at 800 nm. Common uses include Stage and television lighting, Film and broadcast micro-adjustment, Photography neutral-warm correction, and Optical system colour trimming.
What are the key optical specs of CTO-059?
Key published specs for CTO-059 include Colour shift direction: Warming (5600 K → 5050 K); Mired shift: +18 Mired; Correction strength: 1/8 CTO; Average transmittance: ~75.9 % T (visible range); Peak transmittance: ~90.7 % T near 777 nm.
What applications is CTO-059 best suited for?
CTO-059 is commonly used for Stage and television lighting, Film and broadcast micro-adjustment, Photography neutral-warm correction, and Optical system colour trimming. Stage and television lighting - provides the gentlest possible warm correction for fine-tuning colour temperature without visible colour shift.
Can CTO-059 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-059 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-059?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
