VISTA Telescope Mount ­ Factory testing prior to optics integration Paul Jeffers*a, Brian Stobiea, Stan Hermannb, Brad McCreightb a UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK b VertexRSI ­ General Dynamics C4 Systems, 1217 Digital Drive, Richardson, TX 75081, USA ABSTRACT VISTA1 is a survey telescope which will deliver 0.5 arc second images over a 2 degree diameter unvignetted field of view. ... Thermal affects during the period of the test. ...