1/2 Plus Green (Half Plus Green)

kelvin 12 minus green 12 cts

Color correction gel for artificial light — reduces green cast by half a stop. Used when tungsten light throws too much green but full correction pulls too much.

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

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

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

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

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

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

White Balance Setting:

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

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

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

From the crafts

Perspectives

Cinematographer

With a 1/2 Plus Green, you compensate for magenta color casts, which is mainly relevant with LED sources that have a problematic spectrum. The white balance shifts slightly greener – manually set it about 100-150 K colder. This filter is less common than Minus Green and is mostly only used with special LED types or for creative grading effects. With modern cameras, you can often achieve similar effects through Kelvin adjustment.

Gaffer

The 1/2 Plus Green Filter is used significantly less often than Minus Green, but it does come up in specific situations. If you're working with so-called 'Tungsten-LED' or 'Warm-White' LED lights that lean towards magenta, Plus Green can help. It's also valuable with high-speed cameras, which are often too magenta-heavy. Alternatively, Plus Green is used for deliberate cinematic effects – for example, for a sci-fi look or to create scenes with a special atmosphere.