Go 10", it's the only way to get serious. Big difference in seeing over a 6" for sure. My homemade packs down in about 2 minutes and is operational again on site in about 10. I just remove 4 alum struts and lift it off the base, chuck it in the back of the wagon and away we go. Aperture rules !!
I'm 1.75 m tall and viewing at zenith is just below my normal eyeline, I use a chair and most viewing is above the 30 degree mark anyway.
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