RE: [OM] Long Focus vs. Mirror Lens

[Daniel J. Mitchell]

> This is the case because these mirror lenses are solid catadioptric
designs,
> and there's no place 'inside' to put a regular diaphragm.  

 Ah, that makes sense. Is the Zuiko 500mm mirror not solid, and thus
lighter? 11oz isn't all _that_ lightweight, after all. (I'd look on esif,
but..)

 -- dan

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