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Pentax Prototype Zoom Lenses
Table 1. Pentax Prototype Zoom Lenses.
Lens Elements-
Groups
Min. Focus
Distance (m)
Filter Dia-
meter (mm)
Lens Diameter
x Length (mm)
Weight (g) In Production
M 32-39/2.8 Flexi8-80.54963 x 45230no
K 35-70/2.87-71.05869 x 76480no
K 35-70/2.8 Autofocus1.05884 x 94unknownno