• Exceptional quality and optical properties
• 3nm dual-band Q-filter for nebula astrophotography
• Transmission of the H-Alpha and OIII lines
• Additional protection against light pollution

Optolong's L-Ultimate dual band filter has a width at half height of just 3 nm and is an excellent filter against light pollution and for the reddish H-Alpha and blue-green OIII line wavelengths in astrophotography. It also highlights faint nebulae and brings out fine details.

It has the same quality and coating as other Optolong filters and can also be used for fast focal ratios, up to approximately f/4. It doesn't matter whether you use DSLR, CMOS (mono or color) or CCD cameras.

A new revolution in home astrophotography Optolong, a new filter that marks the evolution of the already known L-eXtreme

The spread of urbanization and light pollution are becoming an increasingly growing problem for amateur astronomers and astrophotographers in recent years.
Current solutions to the problem can be very expensive and usually include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.

The L-Ultimate filter is a practical solution for all amateur astronomers who want to use their telescope from urban and suburban areas

Its dual bandwidth was designed for color CMOS cameras
The convenience and effective cost of this filter allow astrophotographers to image a rich selection of astronomical objects, even in heavily light-polluted areas.

Perfect on color cameras, a must have in addition to L-Pro and L-eNhance and L-eXtreme

This filter effectively isolates the emission lines of the nebulae in H-Alpha and OIII and reaches a maximum transmission of up to 93%.

The passband cut is only 3nm.

The performance of this filter delivers superb images with excellent control of light pollution.

Recommended for: Drastically reduce light pollution, Increase contrast for emission nebulae, Save processing time

Recommended use for: Color CMOS