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G'day Brendan,
I'm in the process of doing exactly the same thing with my 10". I have a focuser on the way - a Moonlite DC motorised one. Once that turns up, I'll test focus and believe I may need to cut the end down a little to achieve focus with the camera. Lining the tube to cut down reflections, increase contrast, I've been recommended to go to somewhere like Spotlight and get some A4 sheets of felt. I also need to put a fan and probably some sort of dew control.
Could you please explain what you mean by "100% illumination of the imaging plane standard = 8mm... BAD" and how you've increased it from 8 to 24mm? I haven't heard of this.
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