27-point AF system
(with 25 cross-type sensors)
Extra-accurate detection of the subject
Featuring 27 sensor points across the image field, the PENTAX KP’s sophisticated AF system not only captures the subject in sharp focus, but also automatically refocuses on a moving subject when it moves away from the initial point, with the help of neighboring points. Of the 27 points, 25 cross-type sensors are positioned in the middle to assure high-precision autofocus operation for all types of subjects.

- Cross-shaped sensor
- Liner sensor
- F2.8 Luminous flux Liner sensor
F2.8 luminance flux linear AF sensors
Three center sensors — one in the middle and two others positioned above and below it — are designed to detect the luminance flux of an F2.8 lens for high-precision autofocusing. When using a very fast lens with a maximum aperture of larger than F2.8, these sensors assure focusing accuracy better than that of other sensors (designed for a F5.6 luminance flux).
AF area selection
The PENTAX KP lets you select the AF area and set it to the desired position in the image field, based on your application or subject. It provides a choice of AF modes: Auto (27 points), Zone Select (nine points), Select (a randomly selected single point), or Spot (the center point). It also features a select-area expansion mode to assist in the shooting of moving subjects.
Zone Select
This mode lets you select a set of nine points forming a square zone, which then can be shifted to the desired position by moving the center point. It detects a subject located within this zone, captures it in pinpoint focus, and even tracks its movement — all automatically.

Select-area expansion
When you select one of the 27 sensor points, this function captures the subject in sharp focus using that point, with the help of the PENTAX Real-time Scene Analysis System. When the subject moves away, this system automatically tracks that movement and refocuses on the subject with the help of neighboring points.* It provides a choice of expansion area from eight, 24 or 26 points.
* This function is available when the camera’s AF mode is set to AF.C (Continuous AF) or AF.A (Auto Select AF).

Auto Tracking
Working with the PENTAX Real-time Scene Analysis System, this function accurately detects the subject’s motion based on various factors including color and speed, then keeps pinpoint focus on the subject throughout the imaging process by automatically shifting the in-focus point.*
* This function is available when the camera’s AF mode is set to AF.C (Continuous AF) or AF.A (Auto Select AF).