Dual Focal Length Systems
| 4" clear aperture systems have 20" & 40" focal lengths. |
| 7" clear aperture systems are available with 40" & 80" focal lengths or 80" & 120" focal lengths. |
| All focal lengths are par-focal and the systems are available with illuminated reticle, auto iris and spectral filter wheels. |
| These units can also be provided with the DOS proprietary temperature compensated barrel for star calibration applications. |