Optolong L-Quad Enhance 2''

Optolong L-Quad Enhance 2'': four bands, one filter, more contrast

The L-Quad Enhance Filter (L-QEF) is Optolong's quad-band light pollution filter for color cameras. Four passbands around the H-beta, OIII, H-alpha, and SII emission lines allow nebulae signals to pass through with over 90 percent transmission, while suppressing mercury and sodium lamp emission lines with an OD2 to OD4 blocking depth.

Unlike narrow dual-band filters, the L-QEF maintains a good color balance across the entire spectrum, making it versatile for everything from emission nebulae to galaxies, star clusters, and widefield shots of the Milky Way.

The middle ground between L-Pro and dual-band

The L-QEF sits between a broadband and a dual-band filter in character: more contrast on nebulae than an L-Pro, while maintaining color balance and usability on broad-spectrum objects. Optolong recommends the filter for skies up to Bortle 7.

Thoughtful technique

A near-infrared block up to 1000 nm prevents inflated stars, and the multi-layer ion-assisted coating is scratch-resistant and temperature-stable. The slim 2-inch barrel with M48 thread fits into filter holders, filter wheels, and photo adapters.

Featured accessories

For pure emission nebula work under heavy light pollution, the dual-band filters L-eXtreme and L-Ultimate are the next step.

For whom yes and for whom no

• ✓ Owners of color cameras looking for an all-around filter
• ✓ How to operate nebulae, galaxies, and the Milky Way with a filter
• For those shooting under Bortle 8 or 9, choose a narrower bandpass filter, such as the L-eXtreme or L-Ultimate.

Specifications

You can find more accessories for this merk at the Optolong merk page.