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USED Lumicon OIII Nebular Filter for SCT - Rear Cell
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This filter only works with schmidt cassegrain telescopes. 
It threads onto the back of the tube ONLY!!

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. Visually, the Lumicon Cassegrain OIII filter
isolates just the two doubly ionized oxygen lines (496 and 501 nm lines)
emitted by diffuse, planetary, and extremely faint nebulae. Thus, these
faint objects become much more visible against the blackened background
of space. The Lumicon Oxygen III Filter produces near-photographic
views of the Veil, Ring, Dumbbell, and Orion nebula, among many other
objects. Performs well under both light-polluted and dark skies.
Recommended for telescopes 10" or larger in aperture. To ensure that
your Lumicon filter remains the World's Best, the strictest quality
control standards are employed throughout the production process. Each
Lumicon Oxygen III Filter is individually inspected and proudly
inscribed with the percentage of light transmittance of the OIII
emission lines.

Oxygen III Filter

  • Narrow band pass filter (11 nm) isolates just the two doubly ionized
    oxygen lines (496 nm and 501 nm) emitted by planetary and extremely
    faint nebulae
  • Produces near-photographic views of the Veil, Ring, Dumbbell, Orion, plus many other nebulae

Filed under: Eyepieces & Accessories