CTB-012 Color Correction Filters
CTB-012 is a blue-balancing broadband filter with a moderate cool shift: T lifts from ~74–76 % at 410–420 nm to a peak ~85–86 % at 450–460 nm, slopes to ~58–61 % by 520–560 nm, holds ~55–58 % across 600–700 nm, then recovers to ~59–61 % near 780 nm—delivering clean, predictable cooling with modest loss (~0.25–0.3 OD mid-band).
- Function: CTB broadband filter (moderate cool shift)
- Blue weighting: ~74–76 % @ 410–420 nm → peak ~85–86 % @ 450–460 nm
- Mid-band trim: ~58–61 % T by 520–560 nm; balanced, no magenta cast
- Longer wavelengths: ~55–58 % T across 600–700 nm; ~59–61 % by ~780 nm
- Attenuation & quality: ~0.25–0.3 OD mid-band; smooth, low-ripple curve
- Construction & format: Durable coating on Borofloat®, Eagle XG, D263 T, or soda-lime • 5–450 mm • 0.21–3.8 mm • options: rear-AR & slight wedge
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CTB-012 emphasises 440–470 nm and trims green/yellow smoothly for daylight-leaning balance without banding. Attenuation stays manageable so broadband output remains usable for lighting, imaging, and projection.
Typical applications • Lighting colour correction (cool tungsten/halogen or warm LED toward ~5600 K) • Cameras & cinema (pre-filter for consistent white balance) • Architectural/display lighting (crisper whites) • Machine vision/inspection (enhanced blue-weighted contrast) • Projectors & light engines (gentle spectral shaping).
Need test chips tomorrow or thousands next quarter? CTB-012 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
Description
CTB-012 is a blue-balancing (CTB) broadband filter with a moderate cool-shift. Transmission lifts from ~74–76% near 410–420 nm to a peak of ~85–86% around 450–460 nm, then slopes down through green to ~58–61% by ~520–560 nm. It holds ~55–58% across ~600–700 nm and recovers slightly to ~59–61% by ~780 nm. The effect is a clean, predictable cool-tone correction with modest overall loss (mid-band ≈0.25–0.3 OD).
Key advantages
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Blue-weighted transmission — emphasises 440–470 nm to cool warm sources toward daylight.
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Balanced mid-band trimming — ~56–58% through 520–650 nm reduces yellow/amber without a magenta cast.
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Smooth, low-ripple curve — stable colourimetry with no narrow notches or banding.
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Manageable attenuation — keeps broadband output usable while shaping the spectrum.
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Built to last — durable optical coating for stage, field, and lab use.
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Custom formats — Borofloat®, Eagle XG, or D263 T (0.21–3.8 mm) for high-temp duty to ~450 °C; soda-lime for ≤150 °C. Sizes 5–450 mm; optional rear-surface AR and slight wedge to suppress ghosts.
Typical applications
-
Lighting colour correction — cool tungsten/halogen or warm LED toward ~5600 K daylight.
-
Cameras & cinema — pre-filter for consistent white balance with less in-camera correction.
-
Architectural & display lighting — deliver crisper whites in retail, museums, and exhibits.
-
Machine vision & inspection — enhance blue-weighted contrast while keeping broadband illumination.
-
Projectors & light engines — spectral shaping with a modest brightness trade-off.
Need test chips tomorrow or thousands next quarter? CTB-012 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
