Understanding Auto Focus Target Size

(Updated 20 softwares)

1.    Targets vary in size by model. Some are wider than others due to larger AF sensors and a larger field covered by the sensor.

2.    The grid graduations behind the AF chart is a ruler.  Each block should be exactly 10mm.  Count the number of blocks to find the correct target size.

Examples:  

• A 5 D Mk4 target has 18 graduations making the target size 180mm (± 1mm)  
• A 80D target has 16 graduations making the target size 160mm  (± 1mm)

As shown in Video #1:  The target size is measured across the width of the target and should fall within ±1mm.

Targets should be printed on Card Stock - 100gsm or thicker.