I have this disc now standard in my 6D and use professional second-or these as. Alternatively camera to my EOS 1Ds Mark III (only for orientation). The focusing with fast lenses (eg 50 1.4 USM or 28 1.8 USM) will be facilitated with the focusing screen my feeling actually after the focused object "pops" a little more out, and indeed looks somewhat better delineated from the blurred areas (as with the standard focusing screen) , The 6D is indeed their very good low-light performance (AF and noise performance) really predestined for photography in low light and with high aperture lenses. Note: The EC-S should cause only when using lenses with a minimum aperture 2.8 an improvement.. In so far everything was great and 5 stars is because the product truly brings an improvement in this point (if one should not expect miracles too). However, one should not ignore that the whole thing with a loss of light in the viewfinder is accompanied (as only the Fotogafen, not for the actual recording relevant). First, I noticed that even not on, so I do not think it is a knock-out criterion. Out of curiosity, and because I had the opportunity, but I have two times 6ds compared, each with the same objective, but one with a standard and this focusing screen. There, the difference is quite clear both to the 50 1.4, even more in the 70-200 4 L IS USM. This focusing screen of the viewfinder -in DIRECT comparability is already a noticeable piece dark. About Rate should in practice but not me holding it at least not from the successful use in everyday business from, because that's not nearly as flashy as you notice it in direct comparison.
