HMG-7 Minus Green Filter

HMG-7 introduces a refined minus green strategy by targeting the yellow region at 586 nm rather than pure green, achieving a minimum transmission of 69.0 % in the amber zone. This nuanced approach maintains green at 84.4 % while suppressing yellow to 72.0 %, making it ideal for correcting sources with excessive yellow-green tinting rather than broad-spectrum green dominance. Peak transmission reaches 96.1 % at 679 nm with overall average of 85.3 %, balancing correction strength against system luminance. The filter's distinctive spectral profile suits older tungsten-fluorescent hybrid systems and warm-tinted LED arrays where yellow excess, not pure green, dominates the color cast.

Key Advantages

• Precision Yellow Suppression - Targets the 586 nm yellow minimum with 69 % transmission, specifically addressing warm color casts from tungsten-fluorescent mixes and vintage warm-white LED panels
• Preserved Green & Strong Red - Maintains green at 84 % and red at 92 %, protecting skin tone warmth and preserving natural color balance in scenes where only yellow excess requires correction
• High Overall Transmission - 85.3 % average transmission and 96.1 % peak at 679 nm minimizes light loss, supporting fast shooting speeds and maintaining exposure consistency across lighting transitions
• Hard-Oxide Ion-Assisted Coating - Durable multilayer dichroic design resists coating degradation from thermal cycling, humidity, and field handling in demanding production schedules
• Custom Format Options - Available in round, square, and free-form blanks ranging 5 mm to 450 mm diameter, 0.21-3.8 mm thickness on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG

Typical Applications

• Tungsten-Fluorescent Hybrid Rigs - Balance classic tungsten spotlights combined with vintage fluorescent work lights and floor fill where warm yellow, not green, dominates the unwanted color shift
• Warm-Tint LED Production - Fine-tune increasingly common warm-white LED arrays (2700K-4000K panels) that introduce yellow casts rather than pure green in mixed daylight-LED scenarios
• Broadcast Interview & Talk - Correct aging broadcast studios where tungsten key lights combine with yellow-tinted fluorescent fill, requiring delicate suppression to avoid over-correction artifacts
• Architectural & Real Estate Videography - Balance warm interior tungsten lighting with naturally daylit windows and yellow-dominant interior LED fixtures in property documentation and virtual tours
• Fine Art & Gallery Documentation - Preserve artwork color accuracy when photographing under gallery tungsten spots combined with old fluorescent walls or warm LED accent lighting

Request HMG-7 samples for evaluation on your specific tungsten-fluorescent setup. Full production accommodates rapid prototyping and volume orders.