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General| Focal Length | 28-85mm |
|---|---|
| Maximum Aperture | f/2.8-3.8 |
| Minimum Aperture | f/22 |
| Diaphragm Blades | 6 |
| Lens Mount | Pentax K |
| Format Compatibility | 35mm film / Full Frame |
| Angle of View | 75°-28° |
Identifies lens mount configurations and their stock/part numbers.
Describes lens features like compactness, focus, and mount coupling.
Explains how focal length and focus are achieved via internal mechanisms.
Guidance on diagnosing problems before disassembly to limit necessary repairs.
Lists symptoms, causes, and correction procedures for common lens malfunctions.
Lists specialized tools and optical equipment required for lens service.
Essential advice and safety precautions before starting lens disassembly.
Step-by-step guide for disassembling the lens, covering various component groups.
Procedures for cleaning optical/mechanical parts and applying necessary lubrication.
Detailed steps for reassembling the lens, including specific sub-assemblies.
Procedures for fine-tuning the lens after reassembly for optimal focus and exposure.
Diagrams and details for identifying critical small components within the lens mechanism.
Exploded view and parts list for components common to all lens mounts.
Exploded views and parts lists for diaphragm housing and mount assemblies for various camera mounts.
Exploded views and parts lists for the first, second, fourth lens groups, and helicoid.
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