Hasselblad H6D, User Manual

Page: 104 / 192

FOCUSING DISTANCE CALCULATION
There are two distance scales (in feet and metres) visible
through the window on the upper part of the lens barrel.
The focusing distance is read off the chosen scale from the
central lens index (A).
STOP DOWN / DEPTH OF FIELD PREVIEW
A visual depth-of-field preview can be made by pressing the
STOP DOWN button (B) while viewing the image in the viewfinder.
Depth-of-field is calculated as follows:
1 Focus the lens as required.
2 Make an exposure reading (auto or manual) and note the
aperture setting.
3 Find the markings on either side of the central index that
correspond to the chosen aperture.
4 From these two markings, read off on the required lens
distance scale the two corresponding distances.
5 The depth-of-field (at that particular aperture and focus
setting) is the area included between these two distances.
In the example given here, the focusing distance is set at
nearly 3 metres. At an aperture of f/22, the depth-of-field would
therefore extend from just over 2 m to approximately 4.5 m.
Note that depth of field is not an absolute. Perception of it
depends on several factors and so it should be seen only as a
rough guide.
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