OIII (Oxygen) Filters

From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae.

From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae.

From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae.

The Astronomik UHC filter is for visual deep-sky observation.

The 1-1/4" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects.

Each filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.

The legendary Lumicon 1.25in OIII narrow band-pass filter isolates just the two doubly ionized oxygen lines (496 and 501nm lines) emitted by diffuse, planetary and extremely faint nebulae.

The legendary Lumicon 2" OIII narrow band-pass filter isolates just the two doubly ionized oxygen lines

This Opticstar 1.25" eyepiece is suitable for both visual observation and imaging these are all-in-one high-transmission deep sky filters.

This Opticstar 2" eyepiece is suitable for both visual observation and imaging these are all-in-one high-transmission deep sky filters.