Digital Camera World

AF POINT PRECISION

Source: 1 Vertical focusing at f/5.6 and f/8 The sensors marked in green on this Canon EOS 5D Mark IV display can detect horizontal lines of contrast that ‘break’ the vertical sensor.2 Cross-type focusing at f/4 The horizontal sensors in the outer two blocks of the array detect vertical lines at a maximum aperture of f/4.3 Cross-type focusing at f/5.6 and f/8 The centre block of points is more sensitive and doesn’t require as much light as the outer points to trigger cross-type focusing.4 Dual cross-type ‘diagonal’ focusing at f/2.8 Lenses that have a maximum aperture of f/2.8 can unlock extra precision at the centre of the display.

The reason for this is that the lens attached to the camera affects the precision of the AF sensors. A camera

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