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I have a 200mm f6 newt. In its original set up I could focus a camera with a barlow and with eyepiece projection with any eyepiece that would fit in the tube, but could not get enough in focus for prime focus. I had to move (reluctanly) the primary mirror forward about 50mm. I now have to use a 50mm extension for visual which is ok. I have a few older orthoscopic eyepieces that worked ok last time I tried to image saturn with ep projection. I will need to try some newer ep s to see if there is any difference with focus. I have not done any high magnification photography for a while, but have a new 5x barlow I am waiting to try out on Jupiter.
I am just trying to work out if there is any difference between scopes that are opimised for photography or for visual
Cheers Rick
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