Used Radian Triad Quad-Band Narrowband Filter (2'') William Optics as standard equipment

as standard equipment

narrow-band filters

The major upgrades over the AT66ED and AT72ED come in the type of ED element and the type of focuser

and a large clear aperture the X-Cel is one of the most comfortable eyepieces to use

While at a cooling temperature of -20 °

Used Radian Triad Quad-Band Narrowband Filter (2'') William Optics as standard equipmentPRICE DROP! Was $600, now just $550! This is a 2" Triad Quad Band Filter in excellent condition. It comes in its original jewel box. Any dust you see in the photos is removable it seems that these filters develop an electrostatic charge such that the dust in the air is just attracted to the filter. Description Shoot in any light polluted area H beta, OIII, H alpha, and SII Band Passes Works with any camera including DSLRs Exceptional narrowband &