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I am just assembling my astrophoto gear, and have an Orion 8" reflector on an EQ mount, I imagine the same you have, and also a D700. With the current set up i am not able to achieve prime focus on the camera backplane mounting directly to the focuser with the t-ring; i suspect i need to get about about 1-2 cm closer to the tube. i have found a low-pro focuser on Orion's website, but am not convinced it will get me close enough. what is your configuration wrt the focuser, or are you shooting through an eyepiece?
great pic, and looking forward to more. hopefully i will be able to post some calibration photos soon!