Pentax Prototype Zoom Lenses
| Lens | Elements- Groups | Min. Focus Distance (m) | Filter Dia- meter (mm) | Lens Diameter x Length (mm) | Weight (g) |
|---|---|---|---|---|---|
| M 32-39/2.8 Flexi | 8-8 | 0.5 | 49 | 63 x 45 | 230 |
| K 35-70/2.8 | 7-7 | 1.0 | 58 | 69 x 76 | 480 |
| K 35-70/2.8 Autofocus | 7-7 | 1.0 | 58 | 84 x 94 | unknown |