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.