CTO-009 Color Correction Filter
⅛-CTO glass filter: dips to ~60 % at 450 nm, rises to 80 % at 620 nm, and tops ~90 % beyond 750 nm—nudging daylight fixtures ≈ 400–500 K warmer without dimming them.
- Blue dip: ≈ 60 % T @ 450 nm (gentle suppression)
- Amber ramp: ~80 % T @ 620 nm → ~90 % T > 750 nm
- CCT shift: −400 – 500 K (≈ ⅛-CTO)
- Red plateau: ≥ 85 % T above 665 nm (high output)
- 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-009 provides a gentle amber tilt—about an ⅛-CTO step—ideal for
softening daylight or cool-white sources without stealing punch. Transmission bottoms near
60 % at 450 nm, climbs smoothly to ~80 % at 620 nm, and levels just under 90 % beyond 750 nm.
A 5600 K fixture settles in the 5100 K range, giving warmer skin tones while keeping
efficiency high.
KUPO coats Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates cut to any
outline—from 5 mm chips to 450 mm plates—with thicknesses of 0.21–3.8 mm, shipping
prototypes in about two weeks.
Typical uses: subtle warming on broadcast sets, softening front-wash LEDs, adding
a welcoming glow in retail/architecture, fine-tuning strobes, and boosting red contrast in
machine-vision systems.
Description
CTO-009 delivers a subtle “kiss-of-warmth” — about an ⅛-CTO shift — perfect for daylight or cool-white LEDs that just need a light amber touch. The spectrum dips to roughly 60 % around 450 nm, then climbs smoothly to ~80 % at 620 nm before leveling just under 90 % beyond 750 nm, lowering CCT by roughly 400–500 K to soften clinical highlights without sacrificing output.
Key advantages
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Light ⅛-CTO shift – Fine-tunes 5600 K sources toward ~5100 K for more natural skin tones and easier mixed-light matching.
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High overall throughput – ≥ 85 % above 665 nm keeps fixtures bright and efficient.
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Neutral spectral roll-off – No green spike; cameras and eyes see a clean, amber-tilted spectrum.
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Glass-hard durability – All-oxide coating shrugs off heat and UV that melt plastic gels.
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Custom sizing – Round, square, or free-form parts from 5 mm to 450 mm, 0.21–3.8 mm thick, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG.
Typical applications
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Broadcast & ENG lighting – Warm key lights just enough to blend with interior practicals.
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Stage front wash – Soften high-power white LEDs while preserving punch and colour-mix headroom.
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Architectural spots – Add a welcoming glow to retail or hospitality spaces without amber overcast.
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Photography fill cards & modifiers – Nudge strobe colour for consistent white-balance in mixed setups.
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Inspection & machine vision – Enhance red-channel contrast where only minimal blue suppression is needed.
Need prototypes next week or high-volume lots next quarter? CTO-009 filters can be coated, diced, and shipped to your exact specifications—fast.
