[alistairsam]

Hi Brent,

I do admire your build, a few questions.

have you noticed expansion with long imaging runs?
how did you ensure all truss tubes have their holes perfectly aligned as the distance between upper and lower holes across all tubes would need to be precisely identical to ensure alignment along the optical axis.
finally, how did you ensure the rotating upper cage does not shift around the optical axis when rotated?

11kg is far better than the 20 plus kgs of the gso 12" F4 OTA.

edit: Read Rolf's thread again, got answers to a lot of my questions.