Lumicon Oxygen III (OIII) Filter - 2" (48mm) - Made in USA (Pre-owned)

In Good Condition! Original Livermore, California-made Lumicon filter. Inspected by our technicians. Includes the original Lumicon case with its individual transmission test label (the foam liner in the case shows its age).

Measured transmission on this filter: OIII 496nm: 92% | OIII 501nm: 95% | H-Beta 486nm: 1.3%

The Lumicon 2" OIII narrow band-pass filter isolates just the two doubly ionized oxygen lines (496nm and 501nm) emitted by diffuse, planetary and extremely faint nebulae, so these objects stand out against a darkened sky background. It gives near-photographic views of the Veil, Ring, Dumbbell and Orion nebulae, among many other objects, and performs well under both light-polluted and dark skies.

Each Lumicon Oxygen III filter was individually inspected and labelled with the measured light transmission of the two OIII emission lines.

Specifications

• Type: Oxygen III (OIII) narrowband visual nebula filter
• Size: 2" mounted, standard 48mm filter thread
• Passes: OIII lines at 496nm and 501nm
• Made in USA (Lumicon, Livermore, CA)
• Includes: filter and original plastic case

Pre-owned item. Includes our 30-day warranty.