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Making a 6 inch f2.8 dob
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19-09-2018, 08:42 AM
Merlin66
(Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
IMHO you need to grind out the lip and get a uniform curve across the blank.
The fastest “comet seeker” I built was. 6” f4.
Merlin66
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