Technical Specifications
- Focal Length: 28–70mm
- Aperture Range: f/3.5 (at 28mm) – f/4.8 (at 70mm) to f/22
- Lens Coating: MC (Multi-Coated) for flare reduction and improved contrast.
- Optical Construction: 8 elements in 8 groups (standard Cosina design for this era).
- Diaphragm Blades: 8 blades.
- Minimum Focus Distance (Normal): Approx. 0.8 meters (2.6 feet).
- Macro Mode: Shift-activated macro function at the 70mm end, bringing the minimum focusing distance down to approximately 0.34 – 0.35 meters.
- Max Macro Reproduction Ratio: 1:4 magnification.
- Filter Thread Diameter: 52mm.
- Dimensions: 73mm length × 63mm diameter.
- Weight: Approx. 200g (exceptionally lightweight, utilizing a plastic-engineered barrel over a metal core mount).
- Common Lens Mounts: Most frequently found in Pentax K-mount (PK), but it was also produced in Minolta MD, Canon FD, and M42 screw mounts.
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