This 4 x 4" Dark Red #29 Wratten 2 Optical Gel for Black & White Film from Kodak is ideal for strong contrast improvement since it absorbs green and blue completely and enhances red. In addition to contrast control, red filters enhance skin tones, tonal corrections and are effective for more dramatic landscapes.
| Type | Red |
| Size | 4 x 4" (100 x 100mm) |
| Grade | 29 |
| Filter Factor | 8 (+3 stops) |
| Multi-Coated | Not Applicable |
| Rotating | Not Applicable |
| Effect | More dramatic visual effect than a #25; absorbs green and blue completely and enhances red |
| Application | Create very dramatic sky effects; emphasizing cloud contrast for landscapes; simulate a moonlit scene at midday with slight underexposure; turn foliage white and cut through fog and haze |
| Color Temperature | Not Applicable |
| Construction | Gel |
| Front Filter Thread Size | Not Applicable |
| Front Lens Cap Size | Not Applicable |