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Good job, Malcolm. I'm having a go at the same project. What focusser are you using? I was planning on using a SW Crayford that I have, but ray tracing for an F4 showed that I'd need a 65mm minimum secondary. By using a low-profile focusser, I can get it down to 50mm, a decrease of 40% in the light loss from the secondary shadow. An F5 would reduce it even more, but the struts would have to be longer.
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