Review Of The Canon Ef 75 300mm F 4 0 5 6 Iii Happy This lens has a size of 1221 mm This is a normal size, very convenient in everyday use This lens weighs 480 grams, given the weight of the camera, it may deliver long wearing problems Mounting the filter has a common size mm provides lot of focal length range Canon EF mm f/456 III went on sale in 1999 St Louis #3 In general (not always true) lenses are best when set at 2 stops from wide open At 300mm, max aperture is f/56, so I will try to use it at f/11 or maybe f/8 Use a tripod for better result As for the soft image, it could be the lens (limitation of the lens) as well as how you take the photos OP Canon 75-300mm lens sample photos