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My GSO 6” f6 imaging newt (900mm focal length) out of the box just reached focus using my DSLR so obviously I wanted a bit more free travel focus in and out
Bought some 4mm thick x 20mm dia round cork spacers from Bunnings and packed out the primary mirror using two ( 8mm thick )
Now I have plenty of free travel in and out for focus ( I would estimate between 1 to 1.5 full additional turns of the main focus wheel )
Problem solved !!
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