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I don't have a device to measure it perfectly, but I can tell you it fitted in my William Optics 72FD guidescope, it fitted in a GSO 2" extension tube, it fitted in my ED127, it fitted in a GSO 2" diagonal and it fitted in my Mak-Newt so I am happy with it.
I'm not sure why that guy had such problems.
All the other stuff he described about the paper, the single cap etc was the same for me.
I'd love to see how it stacks up against the telescope service flattener. Does anyone have one??
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