Ritchey-Cretien 
These telescopes are offered in closed tubes or as a truss tube telescope, parralactic or alt-azimuthal mounted or on Dobsonian mounts in many sizes and configurations .
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Fornax 105 parallactic GoTo mount with powerful 16" RC carbon truss tube for astrophotography and visual observation 
The mount is intended for fixed installation in observatories Carries telescopes up to 90 kg in weight - photographic up to 70 kg Exact tracking +/- 0.5"  MC5 GoTo controller with handbox - approx. 50,000 objects in the database Autoguiding connection No disturbing gear backlash Hyperbolic primary and secondary mirror for a large fully illuminated field of view Carbon truss tube with 2 Losmandy Level dovetail bars Large corrected flat field without need for additional correctors 99% dielectric high-reflectivity coating on main and secondary mirror for an even brighter image Significantly shorter cooling down time through open construction and active primary mirror ventilation Long back focus for correctors, reducers and also binoviewers