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My 8" f/5 OTA is 910mm overall. Using the same construction
dimensions scaled up the 12" would be approx. 1355mm. I
imagine a low profile focuser would gain you at least 30mm,
maybe a little more; combined with the aforementioned coma
corrector you might make it. There are often ways of moving the mirror
up the tube without chopping the end off, depending upon the
type of mirror cell, and how it is installed.
raymo
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