Optolong L-Ultimate Filter
Optolong L-Ultimate Filter
Optolong L-Ultimate Filter

Optolong

Optolong L-Ultimate Filter

SKU: L-Ultimate-2


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  • $389.00

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A 3nm dual band filter designed to drastically reduce the effect of light pollution. The 3nm bandpass isolates the nebulae emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks 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 our atmosphere.

Which to Choose?

  • L-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.
  • UHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.
  • L-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. 
  • L-eXtreme is a dual-narrow-band 7nm filter providing a tight spectrum in only H-Alpha and OIII. Suitable for deep sky imaging under light polluted skies, and delivering the richest nebula detail.
  • L-Ultimate is a dual-narrow-band filter, an enhanced version of the L-eXtreme with just a 3nm bandpass on both Ha and OIII.

If you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Ultimate will provide the most faint detail on emission nebula.

The L-Ultimate is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.

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