Used ZWO 2" Blue Imaging Filter Seestar Collimation cap

Collimation cap

25 Optical Tubes Outside Dimensions 635mm x 330mm x 330mm (25" x 13" x 13") Inside Dimensions 559mm x 311mm x 311mm (22" x 12

75 pitch) for use with any standard T-Ring or T Adapter

All metal material

Dobson was well known for constructing large aperture reflecting telescopes capable of deep sky viewing

Used ZWO 2" Blue Imaging Filter Seestar Collimation capPRICE DROP: Was $50, now $40!!! This 2'' blue filter was part of a set of 4 2'' ZWO LRGB filters, which 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