NIB TeleVue Bandmate 1.25" OIII Filter (BFO-0125) New it's $125. This one is now $100 shipped.
This OIII filter particularly enhances planetary nebulae in larger telescopes.
Narrowband filter for high transmission, with high blocking of unwanted longer wavelengths to yield high-contrast images.
Ion beam technology and optical glass produces low scatter in a hard stable coating to reduce changes due to temperature and humidity.
Optical quality ground and polished BK7 glass yields sharp star images — even when filter is placed in front of diagonal.
(stock photo shown)