Optolong LRGB filter 2" Optolong's LRGB set splits the spectrum into luminance, red, green and blue for colour imaging with monochrome cameras. Steep band edges cut UV and IR, OIII falls in both the blue and green filters, and the gap between green and red blocks the 589 nm sodium line. The filters are parfocal (1:1:1 RGB).
Manufacturer model: Optolong LRGB 2" · Specifications checked against manufacturer data on 2026-11-03
Optolong's LRGB set splits the spectrum into luminance, red, green and blue for colour imaging with monochrome cameras. Steep band edges cut UV and IR, OIII falls in both the blue and green filters, and the gap between green and red blocks the 589 nm sodium line. The filters are parfocal (1:1:1 RGB).
| Format | 2" mounted |
|---|---|
| Set contents | Luminance (UV/IR cut), Red, Green, Blue |
| Substrate | B270 |
| Thickness | 1.85 mm |
| Average transmission | >90% |
| Blocking range | 350–1050 nm |
| Light-pollution line blocking | >99% |
| Parfocal | RGB 1:1:1 |
| Surface quality | 60/40 |
| Transmitted wavefront | λ/4 RMS |
| Parallelism | 30" |
Multi-layer anti-reflection coating on a non-cemented substrate, applied by ion-assisted deposition for durability and a stable centre wavelength with temperature.
Optolong LRGB 2" mounted.
| Set contents | Luminance (UV/IR cut), Red, Green, Blue |
|---|---|
| Average transmission | >90% |
Data sheet
Optolong LRGB filter 2" Optolong's LRGB set splits the spectrum into luminance, red, green and blue for colour imaging with monochrome cameras. Steep band edges cut UV and IR, OIII falls in both the blue and green filters, and the gap between green and red blocks the 589 nm sodium line. The filters are parfocal (1:1:1 RGB).
Manufacturer model: Optolong LRGB 2" · Specifications checked against manufacturer data on 2026-11-03
