New, inspected and in excellent condition. This is a Tele Vue OIII (oxygen 3) 2 inch filter, centered at roughly 497nm, 97% Transmission and a ~22nm bandpass.
Televue Bandmate OIII Filter - 2", BFO-0200
The TeleVue Bandmate OIII Filter is fashioned from high quality BK7 optical glass for sharp images.
Ion beam technology for hard, stable coatings.
The TeleVue Bandmate OIII Filter produce high transmission and high blocking of unwanted longer wavelengths. Every filter is checked optically and cosmetically to assure performance and individually serialized.
The TeleVue BandMate OIII filter particularly enhances planetary nebulae in larger telescopes and improves nebula in general by enhancing the "forbidden" lines of doubly ionized oxygen. What's more the TeleVue BandMate OIII filter narrowband filter promotes high transmission, with high blocking of unwanted longer wavelengths to yield high-contrast images.
Thanks to ion beam technology and high quality optical glass the TeleVue BandMate OIII filter produces low scatter in a hard stable coating to reduce changes due to temperature and humidity. The optical quality ground and polished BK7 glass yields sharp star images ?? even when filter is placed in front of diagonal.
Filed under: Eyepieces & Accessories