Filter

Optolong L-Quad Enhance

Quad-band light-pollution suppression filter for colour and one-shot-colour cameras

Passes the Hb, OIII, Ha and SII emission bands

Over 90% transmission at the target nebula lines

Near-IR cut-off at

1000nm

OD2 to OD4 suppression of light-pollution wavelengths (mercury and sodium lamps)

2-inch mounted (M48)

Durable ion-assisted coatings

Suited to broadband targets from Bortle 1 to 7