Oxygen III Filters
The renowned Lumicon Oxygen III Filters are available in 1.25in, 2" and Cassegrain rear cell, isolating just the two doubly ionized oxygen lines (496 and 501nm lines) emitted by diffuse, planetary and extremely faint nebulae.
As a result, these faint objects become considerably more visible against the dark background of space.
These filters deliver near-photographic views of the Veil, Ring, Dumbbell and Orion nebula, amongst a great many other objects, and perform well under both light-polluted and dark skies.
To make sure that your Lumicon filter continues to be World's Best, the most stringent quality control standards are applied during the entire production process.
Every filter is individually scrutinized and proudly inscribed with the percentage of light transmittance of the two OIII emission lines.
The legendary Lumicon Cassegrain OIII narrow band-pass filter threads onto your telescope's SCT rear-cell, and presents male SCT threads for accessory attachment.
The Cassegrain filter cell allows you to change eyepieces without threading/unthreading the filter, and is also easier to change-out than the standard 2" filter cell with gloves on, for cold-weather observing.
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