CCCmarine 0 Posted November 17, 2009 I need to replace a camera but cannot change its location. I need to re-focus to a outdoor courtyard area approx 20wide and 280ft away. The camera is located about 30ft high currently. What would a good lens be for this? I was thinking the Pentax C31219 12.5mm to 75mm would do the trick?. How about camera mating options? Thanks! Share this post Link to post Share on other sites
blackhole37 0 Posted November 17, 2009 From calculations you need about a 67mm lense. Share this post Link to post Share on other sites
zmxtech 0 Posted November 18, 2009 correct for a 1/3'' camera A vari-focal around 5 to 100mm is a good idea then you can get it just right... other options> Your object distance is 280 ft/85.34 m. To cover a horizontal area of 20 ft/6.1 m and a vertical area of 15 ft/4.57 m, you will need * For 1/3" cameras: a focal length of 67.2 mm. * For 1/2" cameras: a focal length of 89.6 mm. * For 2/3" cameras: a focal length of 123.2 mm. * For 1/1.8" cameras: a focal length of 75.6 mm. The following Tamron lenses fit your needs: Vari-Focal: 1/3" 13VM20100AS 20-100mm F/1.6 Aspherical, Manual Iris - NEW 13VG20100AS-SQ 20-100mm F/1.6 Aspherical w/connector, DC Iris - NEW Motorized Zooms: 1/2" 12PZG10x8C 8-80mm F/1.8 Compact Zoom, DC Iris Motorized Zooms: 1/3" 13PZA20x56 5.6-112mm F/1.6, Video Iris 13PZP20x56 5.6-112mm F/1.6 w/Presets, Video Iris Motorized Zooms: 1/2" 12PZA10x8C 8-80mm F/1.8 Compact Zoom, Video Iris 12PZM10x8 8-80mm F/1.8, Motorized Iris z Share this post Link to post Share on other sites
CCCmarine 0 Posted November 19, 2009 thanks, great info! Share this post Link to post Share on other sites
