I had to move my mirror forward (long colimation bolts and springs) and modify the 1 1/4" - 2" adaptor (machine the lip off it) to get enough in-travel for my DSI II pro with a filter wheel fitted on the front. You will probably achieve focus by doing either of these mods with the standard DSI I pro with the filter slider. Happy to post some pics if you want to see what I did.
Peter
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