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I agree an f5 Newt is a great option. And I have had three different sizes GSO Newts 8, 12 and 16, all f5 and collimation was rock solid. It's at f4 that newts start to have issues. As to light weight, I built my own carbon strut 10" f5 Newt, using a GSO mirror set, and it was a great scope, and very light. Strut tubes are easy to build, you can buy carbon tubes online in Australia, and the resin products you need. You would need to build a jig but it's not hard. You can probably still find my build thread in the archives here at IIS.
Have fun.
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