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| Parameter Model | AK-20 DS 20 | Ak-24 DS 28 | Ak-28 DS 28 |
|---|---|---|---|
| Standard Deviation for 1 km Double-run Levelling | 2.5mm | 2.0mm | 1.5mm |
| Telescope Image | Erect | Erect | Erect |
| Magnification | 20x | 24x | 28x |
| Clear Objective Aperture | 30mm | 36mm | 36mm |
| Field of View | 1o20' | 1o20' | 1o20' |
| Shortest Focusing Distance | 0.6m | 0.6m | 0.6m |
| Stadia Multiplying Constant | 100 | 100 | 100 |
| Stadia Additive Constant | 0 | 0 | 0 |
| Sensitivity of Circular Level | 8'/2mm | 8'/2mm | 8'/2mm |
| Graduation Interval of Circle | 1oor 1gon* | 1oor 1gon* | 1oor 1gon* |
| Compensator Type | X-shaped wire suspension air-damping | X-shaped wire suspension air-damping | X-shaped wire suspension air-damping |
| Working Range | +-15' | +-15' | +-15' |
| Dimensions | 190x130x136mm | 190x130x136mm | 190x130x136mm |
| Weight | 1.8kg | 1.8kg | 1.8kg |