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L-Ultimate Introduction

The L-Ultimate is a 3nm dual band designed to drastically reduce the effect of light pollution, the dual 3nm bandpass isolate the nebulae's emissions into H-Alpha (red) and OIII (green-blue) bands. It blocks light pollution, maximizes 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. Maximizing the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Recommended for use with DSLR, colour/MONO CMOS and CCD camera, however, this filter is not suitable for fast ratio systems (f/3 or faster).

The advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is significantly darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter out light pollution and passes signals through the emission lines of nebulae, and effectively reduce the impact of light pollution on astrophotography.

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

Spectrum and Characteristic

Substrate: Optical glass
Thickness: TBC
FWHM:  O3 3nm+Ha 3nm
Blocking range: 300-1000nm
Blocking depth: light pollution  line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30s

*   The transmission curve above is for reference and illustration purpose only

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

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