Optolong L-eNhance filter 2" The L-eNhance is Optolong's tri-band light-pollution filter for colour cameras and DSLRs. It isolates the H-alpha, H-beta and OIII nebula emission lines with peak transmission above 90% while blocking artificial light-pollution lines, for emission-nebula imaging from bright skies.
Manufacturer model: Optolong L-eNhance 2" · Specifications checked against manufacturer data on 2026-11-03
The L-eNhance is Optolong's tri-band light-pollution filter for colour cameras and DSLRs. It isolates the H-alpha, H-beta and OIII nebula emission lines with peak transmission above 90% while blocking artificial light-pollution lines, for emission-nebula imaging from bright skies.
| Format | 2" mounted |
|---|---|
| Passbands | H-beta, OIII, H-alpha |
| Substrate | B270 |
| Thickness | 1.85 mm |
| Peak transmission | >90% |
| Blocking range | 300–1000 nm |
| Light-pollution line blocking | >99% |
| 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 L-eNhance 2" mounted. Not the EOS-C clip-in version.
| Peak transmission | >90% |
|---|
Data sheet
Optolong L-eNhance filter 2" The L-eNhance is Optolong's tri-band light-pollution filter for colour cameras and DSLRs. It isolates the H-alpha, H-beta and OIII nebula emission lines with peak transmission above 90% while blocking artificial light-pollution lines, for emission-nebula imaging from bright skies.
Manufacturer model: Optolong L-eNhance 2" · Specifications checked against manufacturer data on 2026-11-03
