Fixed Focal Length Lens, for 35 mm SLR, Max Aperture: f/4.5, 4 Elements in 4 Groups, Filter size: 52 mm, With Manual Focus, Weight: 118.9 oz (3,371 g)
"Soft image @ max. aperture"
Reviewed by litesong on Mar 29, 2005
I had the screw mount version of the Pentax 500mm f/4.5 lens. Got it decades ago as the new Pentax bayonet cameras & mounts . . .