The 5.7 x 4.9" (145 x 125mm) (WxL), 7.2 oz (205g) ET-120B Lens Hood takes the overall 200 f/2 size of the out to 12.4" (315mm) and weight to 6.2 lbs (2812g) in ready-to-use position. The thumbscrew on the hood adds about .6" (15mm) to the hood width. One of the...