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Hi Chris, with the focal reducer fitted you will need to fit the 2" visual back straight onto the FR and you will probably find the focuser will be almost fully in all the way to reach focus. From memory the distance from the FR to the CCD is about 55mm. Dont hold me to this figure but you probably wont have much in focus left to play with particularly if using a filter wheel.
Experimentation is the key. I could only just come to focus with the qhy9 and filterwheel.
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