A 100/2.8 Macro

General Description
| Product Information | |
|---|---|
| Exact Name | smc PENTAX-A MACRO 1:2.8 100mm | 
| Color | black | 
| Year of Introduction | 1985 | 
| Catalog Number | 28970 | 
| Sold with Hood | — | 
| Sold with Case | hard case: HG-140 | 
Technical Specifications
| Optics | |
|---|---|
| Optical Formula | 7 elements in 7 groups | 
| Aperture Range | f/2.8 ~ f/22 | 
| Number of Aperture Blades | 8 | 
| Minimum Focusing Distance | 0.31 m | 
| Maximum Magnification | 1.0 X | 
| Special Features | fixed rear-element extension (FREE), macro lens | 
| Mechanics | |
| Filter Diameter | 58 mm | 
| Maximum Diameter | 74 mm | 
| Length | 93 mm | 
| Weight | 470 g | 
| Accessories | |
| Cap | plastic clip-on cap, 58 mm | 
| Fitting Hood(s) | no hood required | 
| Fitting Case(s) | hard case: HG-140 |