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TBH if you're looking at a 12" newt F/5 or even F/4 I'd look outside of the GSO brand. The mirrors aren't half bad but a 12" primary is starting to weigh a little and I don't think the cell will be designed well enough to hold collimation out of the box if the 8" is anything to go by. Unless you're into DIY and not afraid to do a bit of work to stiffen things.
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