User's Manual

33

STOP DOWN / DEPTH-OF-FIELD PREVIEW
A visual depth-of-eld preview can be made by depressing the STOP DOWN but-
ton while viewing the image in the viewnder.
Depth-of-eld can be 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 o on the required lens distance scale the two
corresponding distances.
5. The depth-of-eld (at that particular aperture and focus setting) will be 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-eld would therefore extend from just over 2 m to
approximately 4.5 m. Note that depth of eld is not an absolute. Perception of it
depends on several factors and so it should be seen only as a rough guide.
Lens focus setting too
far beyond the distance
of the subject framed by
the central section in the
viewnder
Focus setting too close
for the distance of the
subject framed by the
central section in the
viewnder
Focus setting correct

FOCUS ASSIST
As well as the conventional view on the focusing screen to ensure a sharp image,
the H5D also features an LED focus assist capability appearing as two arrowheads
to the right of the viewnder display (except for lenses with a maximum aperture
of f/6.7 or smaller). The arrowheads provide conrmation of a precision focus set-
ting and are a useful aid when making a setting with eyesight alone.
Manual focus setting
When the left arrowhead alone appears it means the focus setting is too far be-
yond the chosen distance (the area framed within the central zone in the view-
nder) and when the right arrowhead alone appears it means the focus setting
is too close. Focus is correct when both arrowheads appear together. If the focus
cannot be established, then both arrowheads ash.
Automatic focus setting
Focus is correct when both arrowheads are visible together. Focus is incorrect if
only one arrowhead is visible. If the focus cannot be established, then both ar-
rowheads ash.

INFRARED FOCUS SETTINGS
As infrared rays form an image at a dierent plane to that formed by visible light,
the normal focus settings do not apply. Proceed as follows in manual focus mode:
1. Focus the lens in the conventional manner until satised.
2. Note the distance setting against the central lens index.
3. Re-align this distance setting against the infrared mark (coloured red) instead
of the central lens index.
Alternatively if you have already calculated the required distance, you can make
a manual distance setting by using the distance scales together with the infrared
mark instead of the central lens index.
For specialists, please contact your Hasselblad dealer for information about sensor
units adapted solely for infrared photography.