Half-strength color filter that reduces green cast by 50%, ideal for mixed lighting between daylight and tungsten. More subtle than full Minus Green, preventing overcorrection.
Technical Specifications
Color Correction Characteristics:
- Primary Effect: Magenta/Red Shift (Green Reduction)
- Color Temperature Effect: Minimal (under 50 K shift)
- Magenta Intensity: Approx. 50 Mired (half strength vs. Full Minus Green)
- No neutral color temperature shift
Optical Properties:
- Light Loss: Approx. 0.2 to 0.3 f-stops
- Transmission: Approx. 97-98%
- Specifically for green cast correction, not for temperature adjustment
Application
The 1/2 Minus Green filter is used for:
- Fluorescent Light Correction: Fluorescent tubes (T5, T8, T12) in offices, schools, shops
- Tube Lamp Correction: Old fluorescent tube lamps in supermarkets and factories
- Mixed Fluorescent: Combination with Tungsten or Daylight when fluorescent is dominant
- Fine-Tuning: With 1/2 Minus Green, you achieve subtler control than with Full Minus Green
- Combination with CTS: 1/2 Minus Green + 1/2 CTS = precise fluorescent correction
Manufacturers & Products
Lee Filters:
- Lee 091 (2 Minus Green available in 1/2 intensity)
Rosco:
- Rosco 3316 (Minus Green in corresponding strength)
Tiffen:
- 1/2 Minus Green (available as Cut-Gel)
Practical Tips
- Minus Green vs. CTS:
- Minus Green: Green cast compensation only (magenta shift)
- CTS: Color temperature shift + green cast compensation
- Combination: CTS + Minus Green for maximally controlled fluorescent correction
- Full vs. 1/2 Minus Green:
- Full Minus Green: For strong, dominant green casts
- 1/2 Minus Green: For moderate green casts or when Full appears too magenta
- Color Meter Measurement: Use a color meter to accurately measure the green cast:
- Negative Green values: Too much green cast → use Minus Green
- Negative Magenta values: Not enough magenta → use Plus Green
- Combination Strategy:
- Fluorescent only: 1/2 Minus Green
- Fluorescent + Tungsten: 1/4 CTO + 1/2 Minus Green
- Fluorescent + HMI: 1/2 Minus Green (HMI is already blue)
- White Balance Setting:
- Manual: Measure with Color Checker Card and perform white balance
- Preset: Fluorescent mode + magenta offset
- Storage: Minus Green filters can yellow; store in a cool, dark place.
- Practical Use Cases: 1/2 Minus Green is frequently used in:
- Interviews in offices with fluorescent lighting
- Shopping scenes in supermarkets
- Factory and production shoots
- Schools and public buildings
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