CTO-061 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: ~51.9 % T (visible range)
- Peak transmittance: ~88.3 % T near 605 nm
- Minimum transmittance: ~5.2 % T near 486 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-061 delivers a +100 Mired shift to move 5600 K light toward 3400 K. Its smooth spectral slope creates a natural warming effect, with about 51.9 % 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-061 shares the bandpass character of CTO-060 but with a slightly different profile. Its 50 % crossover sits at 572 nm, and transmission peaks at 88.3 % at 605 nm, with T > 85 % from 596-622 nm - an even narrower peak window than CTO-060. Blue is heavily suppressed (avg 6.2 %), while a violet shoulder at 380 nm retains 60.2 %. NIR rolls off to 72.4 % at 800 nm. The tight orange passband and violet shoulder give CTO-061 a distinctive warm-magenta tinge not found in standard longpass CTOs.
Key Advantages
- Tight orange passband (T > 85 % from 596-622 nm) - produces the narrowest focused warm-band window in the CTO series.
- Peak of 88.3 % at 605 nm - centres output in the pure orange region for saturated colour.
- Deep blue suppression with violet shoulder - creates a warm-magenta character from the combination of violet and orange transmission.
- 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 effects - creates a warm-magenta wash with a distinctive violet overtone for unique creative scene design.
- Film and photography colour effects - adds a complex warm tone that combines orange and violet for artistic portrait and landscape work.
- Architectural feature lighting - produces warm orange accents with a subtle magenta character for contemporary design aesthetics.
- Machine vision narrow-band orange - isolates a tight orange window for precision colour-based sorting and inspection.
- Spectral research - provides a narrow, well-characterised orange passband with violet shoulder for optical studies.
Need prototypes in days or production volumes next quarter? CTO-061 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-061 FAQ
What is CTO-061 and what is it used for?
CTO-061 is a Color Temperature Orange Filter - Moderate Orange Bandpass (T50% = 572 nm). CTO-061 shares the bandpass character of CTO-060 but with a slightly different profile. Its 50 % crossover sits at 572 nm, and transmission peaks at 88.3 % at 605 nm, with T > 85 % from 596-622 nm - an even narrower peak window than CTO-060. Common uses include Stage and event lighting effects, Film and photography colour effects, Architectural feature lighting, and Machine vision narrow-band orange.
What are the key optical specs of CTO-061?
Key published specs for CTO-061 include Colour shift direction: Warming (5600 K → 3400 K); Mired shift: +100 Mired; Correction strength: 3/4 CTO; Average transmittance: ~51.9 % T (visible range); Peak transmittance: ~88.3 % T near 605 nm.
What applications is CTO-061 best suited for?
CTO-061 is commonly used for Stage and event lighting effects, Film and photography colour effects, Architectural feature lighting, and Machine vision narrow-band orange. Stage and event lighting effects - creates a warm-magenta wash with a distinctive violet overtone for unique creative scene design.
Can CTO-061 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-061 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-061?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
