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Pentax Prototype Prime Lenses
Table 1. Pentax Prototype Prime Lenses.
Lens Elements-
Groups
Min. Focus
Distance (m)
Filter Dia-
meter (mm)
Lens Diameter
x Length (mm)
Weight (g) In Production
K 8.4/2.8 Bird's-Eye10-7unknown x unknownunknownno
K 20/1.4 AL11-100.257780 x 65445no
Takumar-DA 40/2.8 AL Limited5-40.44963 x 1590no
K 300/2unknown-unknownunknown150unknown x unknown4500no