Hi Mark
Distance of imaging camera is 36mm made up of 19mm from prism, 17mm from face of h9c to chip, sorry but how do I find back focus of camera, from top of prism stalk to prism is 38mm, face of lodestar to chip is 12mm, I think I have missed something as your guider seames way up, the extra 10mm on camera side lets me rotate 360 degrees on a dovetail.
peter
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