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Don't complicate the setup, a finder guider will work well with that scope. I would try that first, and it eliminates the OAG in the spacer equation. Don't firget the Rule of 1/3 when calculating spacing, ie the filters and any cover glass on the way to the sensor extends the focal length by 1mm for every 3mm of added glass. The LRBG filters are 2mm thick, the cover glass AR window ahead of the 1600 sensor is 1mm, so that equals 3mm, so you add 1mm of extra spacing.
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