Used Radian Triad Quad-Band Narrowband Filter (2'') William Optics 2004 (serial numbers beginning with

2004 (serial numbers beginning with 20301xxx and ending with 20406xxx)

counterweight on a two-inch long bolt

Fan Position & Heat Dissipation Vents

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

Open Box Display unit

Used Radian Triad Quad-Band Narrowband Filter (2'') William Optics 2004 (serial numbers beginning withPRICE 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 &