Coronado's PST uses a pentaprism also. It acts as a diagonal and as a focusing device. The focusing knob moves the prism along a 45 deg angle to the incoming light. This changes the path length through the prism which allows focusing. The incoming and outgoing light never change position and this is why the eye piece doesn't move and the PST is a "sealed" unit. The only drawback is a limited range of focusing.
Peter
-------------------- Peter
Telescopes 25 - 318 mm
Binoculars 15 - 88 mm
Microscope 50x - 1000x
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Re: Megrez 110ED + Prism Diagonal = WOW!! (Again)
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