Canon Lens RumorsCanon Patents EF 300 f/4L IS II Patent Canon Rumors Posted onFeb 14, 2011 at 5:00 PM 0 Comments A patent for a 300 f/4L IS II has been filed in Japan. Remember, patents don’t always become real products. Patent Publication No. 2011-27864 published Read more… Share on Facebook Share on Twitter Share on Google+