Optolong H-alpha 3nm filter 2" Optolong's H-alpha 3 nm narrowband filter passes a 3 nm band centred on 656 nm for high-contrast hydrogen-alpha imaging with monochrome cameras or modified DSLRs, rejecting mercury and sodium lighting and natural skyglow.
Manufacturer model: Optolong H-alpha 3nm 2" · Specifications checked against manufacturer data on 2026-11-03
Optolong's H-alpha 3 nm narrowband filter passes a 3 nm band centred on 656 nm for high-contrast hydrogen-alpha imaging with monochrome cameras or modified DSLRs, rejecting mercury and sodium lighting and natural skyglow.
| Format | 2" mounted |
|---|---|
| Bandwidth | 3 nm |
| Centre wavelength | 656 nm |
| Use | Monochrome CCD/CMOS cameras and modified DSLRs |
Multi-layer anti-reflection coating on a non-cemented substrate, applied by ion-assisted deposition for durability and a stable centre wavelength with temperature.
Single 2in mounted 3nm filter from the SHO-3nm range.
| Centre wavelength | 656 nm |
|---|
Data sheet
Optolong H-alpha 3nm filter 2" Optolong's H-alpha 3 nm narrowband filter passes a 3 nm band centred on 656 nm for high-contrast hydrogen-alpha imaging with monochrome cameras or modified DSLRs, rejecting mercury and sodium lighting and natural skyglow.
Manufacturer model: Optolong H-alpha 3nm 2" · Specifications checked against manufacturer data on 2026-11-03
