Used ZWO 2" Green Imaging Filter

This 2'' green filter was part of a set of 4 ZWO LRGB filters that we are selling individually.  It is in excellent condition, with clean glass and coatings.  Comes in its original jewel case.           ZWO's 2" filter design boasts excellent 92% transmission at passband, great optical coatings, and good color separation. The LRGB filters have a mechanical thickness of 5mm, with an additional 2.5mm added for the thread. The optical thickness measures in at 1.85mm. Each filter is more parfocal with a thickness of 1.9+/-0.03 mm. As for the thread, this filter comes with a M48x0.75 thread. Each filter is fine-optically polished to reach an accuracy of 1/4 wave and is equipped with anti-reflection coatings.  Additionally, the ZWO LRGB filters have precision off-brand blocking.   Product specification SKU Number ZWO-LRGB2 Model Number LRGB2 Single Filter, Set, or Accessory Filter Set Filter Type RGB Sets Filter Size 50.8mm (2") Filter Shape Round Filter Insert Style Threaded Filter Optical Thickness 1.85 mm Filter Mechanical Thickness 7.5 mm