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TRUE FOCUS AND ABSOLUTE POSITION LOCK
The obvious situation that would most benet from using True
Focus would be a fashion shoot with a fairly wide angle lens at
a large aperture setting and where the central area of the image
is clothing while retaining focus on the model’s face. Ideally a
fairly controlled and static ow should be planned. A change
of pose by the model should take place only after captures.
The photographer must also resist crouching down, or leaning
forwards or backwards too much before capture.
With the lens at its widest aperture setting, a normal autofocus
setting is made on the model’s face (A), and the camera focus
locked. The composition is then changed to include more of the
clothing (B), but the locked focus setting now extends beyond
the model’s face at (B) according to the laws of geometry. This
will naturally result in an image where much of the subject
closest to the camera and the model’s face will be unsharp.
Solutions involving manual focus / focus lock / resetting of
multi-point sensors are distracting to work ow and prone to
error. Making a True Focus setting at (A) will ensure that focus is
automatically adjusted in accordance with the change of camera
angle.
True Focus uses yaw rate technology and by way of the Absolute
Position Lock (APL) processor, logs camera movement as the
basis for an extremely rapid compensatory focus reset without
any shutter lag. The H6D’s rmware then further perfects the
focus using the precise data retrieval system found on all HC/
HCD lenses.
A
A normal autofocus setting is made on the model’s face and
locked.
The focus setting is approximately 2.5m.
B
When the camera is rotated back down, B, the locked focusing
distance of 2.5m, according to the laws of geometry, extends
beyond a perpendicular line drawn down from the face, creating
unsharpness.
If a True Focus setting instead of a normal autofocus setting is
now made at A and the composition is changed back to B again,
the camera will automatically calculate and adjust the focus of
2.5m to approximately 2.4m, which is the actual perpendicular
distance. The model’s face remains sharp.
H6D www.hasselblad.com
USER GUIDE
To Use
111
A
2.5m
2.4m
A
2.5m
A
B
B
B
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