Within the compact body of the 8-16x21 UCF Zoom II is Pentax's original in-line control system for excellent maneuverability during viewing. Zooming, focusing and dioptric adjustment mechanism can be easily manipulated without taking one's eyes away from the viewing. A fine compact zooming unit, with a robust body that's not easily misaligned.
| Prism Type | Porro |
| Magnification | 8-16x |
| Objective Lens Diameter | 21 mm |
| Angle of View | 8x: 5.0° (actual) |
| Field-of-View | 8x: 261' @ 1000 yd / 86.65 m @ 1000 m |
| Minimum Focus Distance | 9.9' / 3.02 m |
| Exit Pupil Diameter | 8x: 2.6 mm |
| Eye Relief | 8x: 14 mm |
| Interpupillary Adjustment | Not Specified By Manufacturer |
| Dioptric Correction | ±4 |
| Tripod Mount | Yes |
| Dimensions | 4.3 x 4.5 x 2.4" / 10.92 x 11.43 x 6.10 cm |
| Weight | 0.62 lb / 281 g |