photo:prooptic500mmf5.6
ProOptic Maksutov Cassegrain 500mm f/5.6 mirror telescope lens
introduction
this super telephoto lens is a Maksutov Cassegrain catadioptric mirror lens, and as with all such
mirror lenses, share the following characteristics:
this lens is designed as a telescope having a T2 screw mount to attach to cameras, but also a thumb screw to lock in eyepieces.
unlike photographic mirror lenses, it has a manual focus knob rather than the barrel acting as a manual focus control
specs
500mm focal length and field of view (5°) at infinity focus
fixed f/5.6 aperture
closest focus 1.5m although this will require many rotations of the focus knob
filter thread ?95mm
no built-in sun-shade / lens hood
105mm diameter, 220mm long and 1220g
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reviews
photo/prooptic500mmf5.6.txt · Last modified: 2014/05/17 18:11 by gary1