[SOLD] Hb & OIII Nebula Filter

[glasseyes (John)]

[ ** SOLD ** ]

Hb & OIII Nebula Filter

I bought this new from Omega Optical in the USA and I have used it once only. New condition with felt envelope.

$75.00 including postage within Australia

Thanks for looking !!

Details from Omega Optical are as follows

This is a Precision Interference Filter that selectively transmits the Hydrogen beta and Oxygen III emission of Galaxies. This filter has had significant development to produce excellent transmission of the Oxygen lines at 496.9 nm, 500.4 nm, as well as the 486 Hydrogen, while attenuating most of the background light from other sources. This is a relatively wide pass band nebula filter. Mounted in a standard 48 mm eye piece ring.
Specifications:
Central Wavelength, to pass 494, and 486 to 500.4 nm with typical 90%, as well as > 50% (typically 50% of 656.3nm).
Size, 1.78 +0-.006 inches (45mm); mounted in 48mm eye piece ring. Thickness 2.1 mm.
Filter supplied with actual spectral data.