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12" GSO and simular problem
Hi Robin,
sounds you have the same problem I have with the 12" Dob. The way I have solved the infocus problem for the moment is to use a 2X Barlow. This gets a lens further down the tube and I am able to acheive focus.
The other way I have tried and had it work is to use an 35mm extension tube and no barlow and that works also.
I have only tested this so far on the Dob mount and at large targets such as the Moon, Saturn and Jupiter.
Cheers
Greg
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