Altazimuth Mount with Slow Motion Controls. The Vixen PORTA comes equipped with two fine adjustment handles for whole circle slow motion in both directions, very useful in searching and tracking celestial objects. In addition, these are great mounts for terrestrial viewing. 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.
