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According to my business partner who is an actual, university graduated, certified, been employed by BAE aerospace and McLaren, composites engineer and licensed composite construction inspector,(smartarse), Mr. Christen is correct.
As CF does not expand or contract (to any meaningful degree). unless weight is the primary factor, any gains in rigidity will be outweighed by possible distortion of the optical train. This should not really be a factor at <130mm, but above that, it will start to become noticable unless the lens / mirror cell is well isolated. Preferably in Al or Ti which have roughly the same expansion properties as most glasses used in telescope making.
The larger the lens or mirror, the greater the effect will be, by optical standards anyway, you wouldn't notice it in real life.
Also it costs roughly the same to produce a CF tube as an Aluminium one, depending on the quality, but the rejection rate is higher with CF (bubbles and such in the resin etc etc), hence the higher price.
I'll take his word for it.
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