For starters, an area AF system uses a dense grid of AF points, of the type used on professional cameras from Canon and Nikon, as opposed to more widely spaced points found on entry-level and most mid-range models. This type of AF system was first introduced on the
Canon EOS-3 35mm SLR camera, delivering an unheard-of 45 AF points (7 cross-type) in a world where no more than five points were commonly seen. For Canon, this type of AF system is only found on professional models; for Nikon, a 39-point (9 cross-type) Multi-CAM 4800DX is present in the D7000 - the first time an area AF system was ever introduced in an mid-range DSLR - with the more advanced 51-point (15 cross-type) Multi-CAM 3500DX/FX systems found in higher models.
This type of AF system is able to use a large group of points simultaneously instead of just one or two to focus on a subject. This also means that the system can track moving subjects with far greater accuracy and speed than a conventional AF system. Unfortunately, only Canon and Nikon offer this type of AF system, and PENTAX AF technology has historically been short of the performance that C&N have delivered over the years (although significantly improved with SAFOX IX). With that in mind, what should PENTAX do with regard to autofocus? Do you believe that PENTAX can develop this technology for use in a future camera? If so, how should PENTAX do it? If successfully implemented, how great do you think the benefit will be? I personally feel that PENTAX should start with about 25-30 points, with the center cluster cross-type, and develop new, more advanced predictive focus tracking algorithms. What are your thoughts on area AF for PENTAX?
--DragonLord