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MICHAEL GABLER posted an article in NewsTwo of the biggest telephoto Canon lenses - EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM have become renewed. In their third versions, the devices have significantly lost on weight, they became sealed and their ergonomy has significantly improved. Canon EF 400mm f/2.8L IS III, with the dimensions of 163 x 343mm, lost more than one kilogram - from 3850g to 2840g. A slimming treatment of the bigger of the lenses, EF 600mm f/4L IS III USM, has been a little less successful and the lens now weights 3050g (its predecessor - 3920g) and it has the dimensions of 168 x 448mm. Both lenses have been sealed and the white finishing which characterizes the lenses from the L series is thermal insulation, thanks to which the devices are supposed to work better in extreme temperatures. In order to facilitate keeping the lenses clean, the external surfaces of the first and the last lens have been covered with the fluorine coating. 1). Canon EF 400mm f/2.8L IS III USM Both lenses are equipped with the control elements on the body enabling focus adjustment, blocking and stopping focus settings. With the use of the ring knob we can go to two pre-programmed focus positions at any time. The focus mode, focus range, programmed focus restoration and the IS controllers are placed ergonomically. 2). Canon EF 400mm f/2.8L IS III USM The optical systems of both lenses are similar - in both of them we have seventeen lenses placed in thirteen groups, a 9-blade aperture which can be closed up to f/32, while the nominal aperture for 400 mm is f/2.8 and for 600mm - f/4. In both lenses we will find the elements of fluorite lenses and the SubWavelenght Structure Coating (SWC) so we can expect significant reduction in chromatic aberration, flares and blurring while maintaining high quality of the reproduced colors, high resolution and contrast. 3). Canon EF 600mm f/4L IS III USM The autofocus has also been treated as priority. New Canon lenses are equipped with ring USM motors with autofocus and an effective processor enabling fast and quiet AF work. Both lenses make it possible to obtain the "pull-focus" effect with focus regulation and focus preset. Manual focus adjustment in full-time is also available and the focusing speed can be adjusted also by manual electronic regulation. 4). Canon EF 600mm f/4L IS III USM The lenses are to appear on sale in December and they will cost respectively: Canon EF 400 mm f/2.8L IS III USM - $12,000 Canon EF 600 mm f/4L IS III USM - $13,000 In the sets we will find only soft cases. Hard suitcases and new short hoods will be available optionally.