Source: Photography Directory and Buying Guide 1977 Via: Nesster @ Flickr.
Lenses Tested:-
SMC Pentax 50mm f/1.2
SMC Pentax 50mm f/1.4
SMC Pentax 55mm f/1.8
SMC Pentax Macro 50mm f/4
Well, these lenses are really excellent! The resolution performance is superior!