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Protostar Diagonal for an 8" Newtonian F/6

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This came out of an Orion 8" Deep Space Explorer Dobsonian which I upgraded many years ago.
I believe the manufacturer is Protostar.
The minor axis is around 1.5" and the major axis is 2-1/8".
The vanes have a radius just under 4.5".
The mirror is in excellent shape.
It comes with a 3 vane spider and bolts.
Continental US buyers only please.