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One more suggestion from someone who has never made a telescope is that before you get too far in to deciding what your scope will be, it might be worth going to some of the bigger star parties and having a look at and through some big scopes. I found this very useful before my recent acquisition. I was tossing up between a 16" or 18" and to look through both size scopes showed me that there was not a great difference, but looking at them convinced me that the extra weight and bulk of an 18" was something that I wouldn't want. I reckon a 24" would be a big bit of kit to move around, although you would certainly collect a lot of light. I am no expert on optics, but I would also imagine that the bigger the mirror, the more critical good quality might be.
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