I wonder what 'magic material' the tube is made from? In typical Roland fashion his attention to detail is astonishing, as opposed to other companies who would probably shove it in a CF tube and use the CF marketing gravy train to their advantage.
Quote:
The focus will be quite stable because the tube material was chosen to
counteract the natural shift of focus of the crown glass elements. It is not
aluminum - which would cause horrible focus shift. It is not carbon fiber -
which would cause horrible focus shift in the other direction. It is magic
material.
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