| Lens Name | smc Pentax-A |
| Focal Length | 400 |
| Diaphram Scale | 5.6-45 |
| Auto/manual/preset diaphragm | Auto |
| Number of elements and groups | 7/6 |
| Angle of view | 6 |
| Closest focus (cm) | 2.8m |
| Weigth (gm) | 1240 |
| Length of lens (mm) | 277mm |
| Biggest barrel diameter (mm) | 85mm |
| Filter size (mm) | 77 |
| Introduced | 1984 |
| Discontinued | 2004 |
| Price when new |