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For so many years the beginning astronomer was forced to buy a mount that was unstable and almost useless when viewing at high power. More often than not, the frustration of using an unstable mount resulted in the telescope only being used for one night and being left in a closet to collect dust. The Porta mount changes all that. It is one of our proudest designs. The combination of smooth movement, rigid design and stable platform makes your first use a pleasure and will bring you back to view more and more of the night sky. The PORTA comes equipped with two fine adjustment handles for whole circle slow motion in both directions. It is useful for fine motion used in searching and tracking of celestial objects. In addition it is a great mount for terrestrial viewing. Our gear drives it make it a simple matter to precisely track a planet or a ship on the horizon by simply turning the elevation and or azimuth control handles. The 'World-Standard' dovetail attachment system on PORTA was developed by Vixen. This allows the PORTA to accept various dovetail mounted optical tubes and binoculars.MOUNT SPECIFICATIONS - Continuous Slow-Motion Manual Control - Unique Lockless System - Full Height Tripod: Max 57 inches to Min 37 inches - Weight Capacity: 15 lbs - Mount Weight: 4.5 lbs - Includes Center Tray - Clutch System fully adjustable with hidden tool set