R ramkrishna jana Member Joined 30 Jul 2011 Messages 142 Reaction score 17 16 Sep 2016 #1 friends how to adjust jams 12ft dis h focal length...
sohail6196 Member Joined 3 Jul 2016 Messages 183 Reaction score 149 17 Feb 2017 #2 Calculate length height and depth thanuse this.. Focal lenth,=w*w*w/16*depth*height