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.
Specifications
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"
Coating
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 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
