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This is a used 1.25-inch Lumicon O-III filter, made in the USA. It is in good condition: there is some dust on the filter that is difficult to remove, but it is otherwise relatively clean, and the body is unmarked. See the photos. We have taken these issue conditions into consideration in the pricing.
The photos show some dust on the optics that is being held on by electrostatic charges; it is difficult, but not impossible, to remove this. This should not affect your use of this filter.
It comes in its original jewel case.
Description
New Improved Generation 3 Lumicon 1.25 Inch Oxygen III Filter
Generation 3 Lumicon 1.25 Inch Oxygen III Filter visually isolates the two doubly ionized oxygen lines (496 and 501nm lines) emitted by diffuse, planetary and extremely faint nebulae.
The two strongest emission lines in planetary nebulae come from the recombination of doubly ionized oxygen atoms which produce light at 496nm and 501nm. According to the test data provided, this new Gen III filter passes 98.6081% of the light emitted at 496nm and 98.5658% of the light emitted at 501nm and transmits significantly less than 1% at all wavelengths outside of its design bandpass.
Oxygen III - This is the highest contrast Nebula Filter, a line filter for only the two emission lines of oxygen. A great choice for observations of supernova remnants and other nebulae that glow in OIII. 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.
Other types of objects that glow in all parts of the visible spectrum (e.g. galaxies) are reduced visibly, but some normally invisible regions of nebulae are clearly visible. This filter fits all standard 1.25-inch eyepieces and filter wheels.
Oxygen III Filter helps faint objects become much more visible against the blackened background of space and produces near-photographic views of the Veil, Ring, Dumbbell and Orion nebula, among many other objects. This filter performs well under both light-polluted and dark skies.
Lumicon filters remain the world’s best and strictest quality control standards are employed throughout the production process. Each Lumicon Oxygen III Filter is individually inspected and scanned with the percentage of light transmittance of the OIII emission lines.
Performs well under both light-polluted and dark skies. Recommended with eyepieces that yield a 5 mm to 7 mm exit pupil. 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 two OIII emission lines.