X, announced in February 2016 with sales expected to begin in April of that year. The EOS 5D Mark IV, announced in August 2016 as the replacement for the 5D Mk III. The release of the 5D Mark III gave Canon the lead once again in this category; previously, its top-line cameras had 45 AF points, which led the industry until Nikon released its D3 and D300 DSLRs with 51-point AF systems. A higher number of AF points increases the chances of a sharply focused photograph in situations where the subject travels across the frame at high speeds (e.g. sports, wildlife). Having so many AF points also helps relieve the photographer from having to use the 'lock focus and recompose' method of framing a photograph that can introduce focusing inaccuracy. The camera generally focuses on the closest object or on human faces, which may not be what the photographer wants, so EOS cameras equipped with a multi-point AF system still allow the photographer to manually select an AF point. The EOS-3, EOS-1v, all EOS-1D models prior to the EOS-1D X, EOS 80D, EOS 77D, and EOS 800D/Rebel T7i feature a 45-point AF system. Most Canon DSLRs introduced since late 2005, starting from the EOS 20D and the Rebel XTi (400D), feature a nine-point AF system in a diamond-shape formation. The EOS 5D, released in 2005, takes this 9-point AF system a step further by introducing six more 'invisible' AF points (i.e., not user selectable) in helping the camera acquire focus faster during subject tracking. There have been several exceptions to Canon's recent rule of a 9-point AF system. The EOS 1000D (Rebel XS) has the 7-point AF system of most older Canon DSLRs. The EOS 7D, released in 2009, has a 19-point AF layout, fitting essentially within the same diamond-shaped area of the frame as the nine-point layout. The EOS 70D, released in August 2013, inherited the 7D's 19-point layout, but with fewer AF control options. The 70D system was in turn handed down to the EOS 750D (Rebel T6i) and 760D (Rebel T6s), announced in February 2015. As mentioned above, the EOS 5D Mark III, EOS-1D X, EOS 5DS/5DS R, and EOS-1D X Mark II have 61-point AF layouts. The EOS 6D, released in October 2012, has an 11-point layout. The EOS 80D, announced in 2016, marked the return of 45-point AF systems to the Canon EOS line, as