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For collimation the star only needs to be far enough away to achieve focus. Strong spherical aberration results but it doesn't affect alignment of the optics. Slightly to one side of focus you'll see a bullseye with a bright ring which can be centered and made even. I collimated a standard 9.25 at about 60 feet from the star from memory.
My 8" EdgeHD needs about 55ft while I have to do the 11" outside as it needs more distance.
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