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hi steve
well actually the biggest is the 18" but it is a carbon fibre truss skywatcher dob. way more expensive than the 16" from the regular series.
I have the 12" which i recommend definitely. the tracking / goto is spot on and the views are high quality. The mount has a different system on the 14 and 16" versions i think needing be in two parts rather than one i don't know if that has any effect on tracking.
the 12" is quite large (even as a flex tube) you'd really need a semi permanent spot for the 14"-16" versions. looking at the prices they are so much more affordable than when i got mine i think the price for 12" would sit between the 14 and 16" models now, so they really are great value.
Russ
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