> A catadioptric lens, to the best of my knowledge, is a lens which is
> solid -- the main mirror is the rear surface of the same block of glass
> which also is the front of the lens. So 'solid catadioptric' seems to be
> a tautology.
Lars,
The 'un-solid' cat lenses consist of two seperate mirrors.
The solid chunk of glass being replaced by air.
Presumably, the higher refractive index of the chunk of glass
allows smaller (but heavier) lenses for a given focal length/f.
duncan
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