CTO-010 Color Correction Filter
¼-CTO glass filter: trims blue to ~33 % @ 500 nm, passes > 90 % above 670 nm, and nudges daylight fixtures ~1000 K warmer without heavy light loss.
- Blue region: ~20 % T deep violet → 33 % T @ 500 nm
- Amber ramp: 60 % T @ 575 nm → > 90 % T > 670 nm
- CCT shift: −1000 K (≈ ¼-CTO)
- Red plateau: 90 – 92 % T through 670–780 nm
- Construction: Ion-assisted hard-oxide; 5–450 mm, 0.21–3.8 mm thick
- Custom options: AOI tuning, ripple smoothing, rapid prototypes
Learn more
CTO-010 delivers a medium amber lift—about a ¼-CTO shift—dropping a 5600 K
source into the 4400–4600 K range. Transmission starts near 20 % in the deep violet,
reaches ~33 % around 500 nm, crosses 60 % at 575 nm, and tops 90 % beyond 670 nm,
giving fixtures a warm edge without slashing output.
KUPO coats Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG in any outline—from
5 mm chips to 450 mm plates—with thicknesses of 0.21–3.8 mm. Prototypes ship in
about two weeks.
Typical uses: warming daylight panels in broadcast or cinema, softening cool LED
stage washes, giving architectural spots a welcoming glow, tuning photo strobes in mixed
light, and enhancing red contrast in machine-vision setups.
Description
CTO-010 provides a medium amber lift—roughly a ¼-CTO correction—that takes a 5 600 K daylight source down into the 4400–4600 K range. Transmission starts near 20 % in the deep violet, creeps to about 33 % around 500 nm, then climbs steadily, crossing 60 % near 575 nm and topping 90 % above 670 nm. The result is a gentle, even warmth without a green shift and with very little overall light loss.
Key advantages
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¼-CTO colour shift – Warms cool-white LEDs or HMI daylight heads by ≈1 000 K for pleasing skin tones and natural interior ambience.
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High red throughput – > 90 % transmission from 670 nm to 780 nm preserves punch and fixture efficiency.
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Smooth spectral ramp – No spiky absorption; cameras and human vision see a clean, neutral amber tint.
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All-glass, all-oxide – Resists heat, UV and scratch damage that quickly ruin plastic gels.
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Custom formats – Any shape from 5 mm to 450 mm and 0.21 – 3.8 mm thick on Borofloat®, soda-lime, Schott D263 T or Corning Eagle XG.
Typical applications
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Broadcast & cinema lighting – Balance daylight panels to match tungsten practicals or golden-hour exteriors.
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Stage wash & footlights – Add warmth to front-of-house LEDs while keeping lumen loss minimal.
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Architectural accenting – Give retail, hospitality or museum spaces a welcoming glow without overly amber saturation.
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Photo strobes & modifiers – Fine-tune flash colour in mixed-light environments for easier post-production grading.
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Machine-vision & inspection – Enhance red-channel contrast when only modest blue suppression is required.
Need prototypes next week or a high-volume run next quarter? CTO-010 filters can be coated, diced and delivered to your exact specifications—fast.
