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those photos are handy to a degree, i have a 1.25" to 2" (for 1.25" EPs) then i can unscrew my 2" adapter (that holds 2" EPs) from the focuser. This inside diametre is about 60mm, which is bigger than 2" obviously. Having the 2" adapter unscrewed and just leaving the focuser only, now gets me about 30mm closer inwards. I dont know what I am really looking for but i need something that will screw into the focusers thread and attach to a 450d. But like I said, my friend is a machinist so we are just thinking of making something up ourselfs.
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