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are there any reasonably priced 3.5 or 3" focusers, doesn't have to be motorized, but low profile would be ideal as I can then keep the secondary optimally small and not too big.
I came across websites for diy spiders where they talk about deficiencies with the 3 point secondary adjustment vs the 4 point where adjustment is in x,y,z and the 3 point isn't? not sure which is accurate though.
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