Originally posted by Class A The same reason that stops me from entertaining the thought that the moon is strung to the earth by an invisible rubber band.
It make sense to use the f/5.6 sensors first as they see more subject distance range. It also makes sense for the AF procedure to take a bit longer with the f/2.8 sensors as the focus movements will have to be more precise. However, I do not believe that camera internal processing adds further delays or that higher resolution sensors take noticeably more time to evaluate.
You are free to believe what you want, but you haven't supplied any reason for your belief. Normally such belief is called religion
What seems clear enough to me is that adding more calculations and 2x as many sensors to read, coordinate and evaluate cannot be faster unless some other optimizations or changes were made. It is certainly possible that when the algorithms were re-written for the new features they were optimized and improved such that the extra processing has little or no speed impact.
Canon uses a dedicated AF processor in the models we have been discussing, which we know Pentax does not employ, So, consider the fact that the main processor now has to read and process data from 2x as many sensors as before, so there has to be more overhead and processing cycles on the main (2+ year old) prime engine in the K5.
Whether the extra processing is noticeable or not cannot be separated from the overall AF system performance, which also includes the performance of the attached lens, so we will never know.
I hope that the system is more accurate than the K5Mk1 and at least as fast overall. It is my belief that the lenses are the thing holding back the Pentax AF speed, especially the SDM versions, so it could well be that the camera will still be faster than the lenses and the overall system will not slowdown. I am looking forward to well executed tests that will answer some of these questions.
Ray