Hi Kon,
you should connect the camera straight to the reducer, without the diagonal. I think the diagonal will extend the light path a little too much and you may not be able to reach focus with the camera.
Doesn't the DSI II COlour come with a 1 1/4" nosepiece threaded for filters? My DSI II Pro did, although I use it with the 2" adaptor and the filter slide.
Dean
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