1/2 Plus Green (Half Plus Green)

Technical Specifications

Color Correction Characteristics:

• Primary Effect: Green Shift (Magenta Reduction)
• Color Temperature Effect: Minimal (under 50 K shift)
• Green Intensity: approx. -50 Mired (half strength vs. Full Plus Green)
• No neutral color temperature shift

Optical Properties:

• Light Loss: approx. 0.15 to 0.25 f-stops
• Transmission: approx. 98%
• Specifically for green tint addition, not for temperature adjustment

Application

The 1/2 Plus Green filter is used for:

• Warm-White LED Correction: LED sources (e.g., 2700-3000 K) with overly magenta spectrum
• High-Speed Camera Correction: Many HS cameras require Plus Green for natural colors
• Special LED Types: Cheap or old LED chips that are too magenta
• Cinematic Grading Effects: Deliberately used green shift for science fiction or horror
• Fine-Tuning: With 1/2 Plus Green for more subtle control over Full Plus Green

Manufacturers & Products

Lee Filters:

• Lee 092 (2 Plus Green available in 1/2 intensity)

Rosco:

• Rosco 3317 (Plus Green in appropriate strength)

Tiffen:

• 1/2 Plus Green (available as cut gel)

Practical Tips

1. Plus Green vs. Minus Green:

• Minus Green (Magenta): Compensates for green tint → for fluorescent/old tungsten lamps
• Plus Green (Green): Compensates for magenta tint → for problematic LEDs/HS cameras
• Opposites: One color for opposite problems

1. Full vs. 1/2 Plus Green:

• Full Plus Green: For extreme magenta tint
• 1/2 Plus Green: For moderate magenta tint or for more subtle effects

1. LED Situations:

• Standard LED (5600 K Daylight): No green filters needed
• Warm-White LED (2700-3000 K): Often Plus Green required
• Cheap/old LED chips: Frequently Plus Green for correct spectrum

1. High-Speed Cameras: Many HS cameras (e.g., Phantom, Sony FS7 in HFR) require Plus Green for natural skin tones:

• 1/2 Plus Green standard at 240 fps
• Full Plus Green at 1000+ fps

1. Combination Strategy:

• Warm LED only: 1/2 Plus Green
• LED + Daylight Mix: 1/4 CTB + 1/2 Plus Green
• HS Camera with Tungsten: Full Plus Green

1. White Balance Setting:

• Manual: Set approx. 100-150 K colder with Color Checker Card
• No Presets: Plus Green must be manually calibrated

1. Storage: Plus Green filters should be stored protected from UV and heat.
2. Creative Use: Plus Green is also used deliberately for:

• Science fiction scenes
• Medical/laboratory scenes
• Digital/Matrix-like effects
• Special atmospheric looks