For over a decade, Pentax has only made iterative improvements on the SAFOX AF system. More recent updates added more rows and columns but did not change the layout of the AF array. A closer examination of the SAFOX 13 AF grid reveals both similarities and differences from previous generations of the SAFOX autofocus system.
SAFOX 13 continues to use fundamentally the same layout of rows and columns as that of SAFOX 12. Among the selectable points, the center area is still a 5x5 grid of cross-type points, flanked by two columns of linear points on each side. The number of selectable points in each of these side areas has, however, increased from 4 to 8. The total number of selectable AF points is now 41, up from 33 in SAFOX 12 (K-1 and K-1 Mark II) and 27 in SAFOX 11 (K-3 and K-3 II).
But more significantly, SAFOX 13 adds an additional 60 assist AF points, dramatically increasing AF point density and making each point much smaller. Looking at pages 60 and 61 of the
manual, when selecting a particular point to use, you can choose whether or not to use the four adjacent assist AF points.
Select mode uses these additional points, while
Select (S) does not. It also means that the
Spot mode is much more precise than before. The AF grid also covers a much wider portion of the frame. All of these improvements are likely to be the result of both improved optics and a higher-resolution AF sensor.
Despite the similarities to earlier generations of SAFOX, the smaller AF points and higher point density represent a very welcome change. It addresses a common complaint with earlier Pentax cameras that the AF points are too large for precise selection. Combined with the high-resolution metering sensor enabling AI subject recognition, new AF algorithms, and an overhauled drive system which gives the AF system more time to track movement, I can see a dramatic improvement in AF.C tracking performance in the K-3 Mark III.
Questions, thoughts, or comments?
Draco
Last edited by bwDraco; 04-04-2021 at 02:04 PM.
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