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Thanks guys, it's all fascinating reading, I've definitely got some more research to do.
I'm curious about how different systems responded to different f/ratios (actually, as an engineer, I'm pretty curious about everything I touch), but I think I'm happy to stick with relatively wide field imaging with an f/4 or 5 newt for now. I know I'm not even close to stretching the capability of my 8" f/5, so an upgrade would be purely a luxury at this point.
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