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Jim, I have a bahtinov mask for my TOA130 it was not made by the same person, but a guy from ASSA it is excellent. Here are the dimensions of mine:
Diameter: 170mm
Diameter of where cutouts start and finish: 130mm. which is obviously the diameter of the objective.
This slots neatly inside the dewshield, I have put a small piece of insulation tape in 4 segments of mine so it will not damage the internals of the dewshield when I insert it.
You are getting a lovely scope, is it new or 2nd hand, also has it the 2.7" or 4" focuser?
Just make sure if it needs work on it, don't send it to anyone other than Takahashi in Japan, unlike my effort when it went to a mob in Sydney and got trashed. It is now good as new again after going back to Japan, a very expensive exercise.!!!!
Cheers
Peter
Last edited by Exfso; 23-02-2012 at 11:31 AM.
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