"Alan French" wrote

Are you sure? At NEAF I believe Celestron said the prototype they were
showing was only an 18", although the production model will be a 20".

Hi Alan,

Although I didn't get a close look, the scope at RTMC was
structurally different from the one at NEAF. At NEAF, it was an open
Surrier truss with carbon fibre truss tubes, and at RTMC it was a
solid tube.

H.