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Simon,
Having gone travelling several times with scope, the space occupied is the real premium. I'd have to say the choices are easy:
a) one of Alex's compact dob's; having seen his 12" it packs into a box that would shame most 5" SCT's.
b) a 5" SCT or Mak, which can fit on a solid camera tripod. The extra aperture wins easily over small refractor, yet they are compact and effectively sealed from dust.
I can say from personal experience forget a 4" refractor, 7" Mak or 8" SCT, these are all too big unless you are planning on taking a trailer.
c) cull the eyepieces and other crap down to the bare essentials. 3 eyepieces, max.
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