CTO-007 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: ~54.9 % T (visible range)
- Peak transmittance: ~88.4 % T near 627 nm
- Minimum transmittance: ~7.8 % T near 406 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-007 delivers a +100 Mired shift to move 5600 K light toward 3400 K. Its smooth spectral slope creates a natural warming effect, with about 54.9 % 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-007 applies a strong amber tilt—roughly a ¾-CTO step—for cooling-daylight fixtures that need to land closer to classic tungsten warmth. Transmission is under 10 % through the violet–blue band below about 440 nm, rises to ~20 % at 490 nm, crosses 40 % near 530 nm, and peaks just shy of 90 % around 625 nm before tapering toward the deep red. The smooth ramp removes enough blue/green to shift a 5600 K source down to roughly 3600 – 3800 K, providing cosy ambience while keeping plenty of output.
Key advantages
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Robust ¾-CTO shift – Drops CCT by roughly 1 800 K, ideal for marrying daylight heads to tungsten fills without a full CTO hit on brightness.
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High red throughput – ≥ 80 % from 600 – 700 nm preserves luminous punch and natural skin tones.
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Progressive blue cut – No sharp notches, so cameras see a neutral spectrum without unwanted green spikes.
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Heat-resistant oxide coating – Handles high-power LEDs, HMIs, and follow-spots where plastic gels degrade.
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Customisable blanks – Round, square, or free-form pieces from 5 mm to 450 mm, 0.21 – 3.8 mm thick, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG glass.
Typical applications
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Film & broadcast lighting – Warm daylight panels or HMIs so they cut seamlessly with tungsten practicals.
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Stage & architectural rigs – Turn cool house LEDs into inviting amber washes without disposable gels.
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Photography modifiers – Shift flash packs toward incandescent warmth for mixed-light shoots.
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Museum & retail displays – Add warmth to LED spotlights while keeping UV extremely low.
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Machine-vision illumination – Boost red-channel contrast when inspecting organic or heat-printed materials.
Need prototypes in days or production lots next quarter? CTO-007 filters can be coated, cut, and shipped to your exact spec—fast.
FAQ
CTO-007 FAQ
What is CTO-007 and what is it used for?
CTO-007 is a Moderate-Strong Orange with Controlled Yellow Peak. CTO-007 balances aggressive warm shift with moderated yellow transmission, delivering a 50 % point at 541nm and 88.4 % peak at 627nm. Red transmission reaches 86 % while blue drops to 13 %, with yellow precisely controlled at 80 %. Common uses include Cinematography and Narrative Film, Television Production, High-end Commercial Production, and Daylight Studio Environments.
What are the key optical specs of CTO-007?
Key published specs for CTO-007 include Colour shift direction: Warming (5600 K → 3400 K); Mired shift: +100 Mired; Correction strength: 3/4 CTO; Average transmittance: ~54.9 % T (visible range); Peak transmittance: ~88.4 % T near 627 nm.
What applications is CTO-007 best suited for?
CTO-007 is commonly used for Cinematography and Narrative Film, Television Production, High-end Commercial Production, and Daylight Studio Environments. Cinematography and Narrative Film - Shift daylight sources toward warm tungsten equivalents with controlled color saturation for narrative cinematography and dramatic warm-toned scenes.
Can CTO-007 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-007 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. Flexible Geometry and Substrate - Round (5-450mm), square, free-form options on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG; 0.21-3.8mm thickness range.
What should I know about angle of incidence and durability for CTO-007?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
