Opotlong L-Ultimate Light Pollution Filter

The Opotlong L-Ultimate Light Pollution Filter is a 3nm dual band designed to drastically reduce the effect of light pollution. The filter isolates the nebulae emissions into H-Alpha (red) and OIII (green-blue).

Opotlong L-Ultimate Light Pollution FilterIt is effective in blocking light pollution, maximizing the signal from nebulae and darkening the sky background. This includes blocking artificial light from mercury vapor lamps, high and low pressure sodium vapor lights and unwanted natural light caused by the emission of neutral oxygen in the atmosphere. The filter also maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm).

The Opotlong L-Ultimate Light Pollution Filter is designed to be used with DSLR, CMOS and CCD cameras and is suitable for telescopes with an f-ratio of f/4 or higher.

The filter is different from the Opotlong L-eNhance and L-eXtreme series of dual-narrowband filters in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. The L-Ultimate has also been optimized in terms of halo performance so that there is no obvious halo when shooting on a bright object.

The Opotlong L-Ultimate Light Pollution Filter specifications include:

– Size: 1.25″ mounted (M28.5×0.6 thread)

– Thickness: 1.85mm

– FWHM: OIII 3nm, Ha 3nm

– Blocking Range: 300-1000nm

– Blocking: OD4

– Surface quality: 60/40

– Transmitted Wavefront RMS: λ/4

You can learn more about the Opotlong L-Ultimate Light Pollution Filter here.

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