Hi Simon.
It appears you have 120mm of space between the flattener and the sensor. This may allow you to reach focus on something close, but I'm unsure if it would work on the stars, i dpnt think your ficuser would even have enough travel to allow focus on the stars with 120mm of space beyond the flattener. Also it's the incorrect distance for your flattener, which requires 75mm of back focus. Have I missed something, as to why you have this much space?
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