Hasselblad 500C/M Instruction Manual page 35

Fig 58
Fig 59
So decide on the desired framing and camera
angle and use the spirit level (27) to level the
camera. In hand-held work, you should con-
centrate on keeping the camera level at the
moment of exposure.
This is extremely important, since the ultra
wide-angle lens demands careful alignment
for accurate rendition of vertical lines in the
subject. Leveling the camera with the aid of
the spirit level is even easier if a tripod is used.
Focusing screen adapter (Fig. 59)
The focusing screen adapter is used when an
exact check on depth of field and image com-
position is necessary. It is attached to the
camera in place of the film magazine. The
focusing screen adapter has a seat to permit
attachment of a magnifying hood, prism
viewfinder, or focusing hood.
Image checks on focusing screen
Set the shutter at B.
Set the lens at the maximum aperture.
Set the time exposure lock (15) at T.
Open the shutter by depressing the shutter
release.
When the checks have been completed, return
the time exposure catch to O, thereby closing
the shutter. Cock the shutter with the film ad-
vance crank. Remove the focusing screen
adapter and reattach your film magazine.
Then make your exposure in the ordinary
way.
Cleaning the Biogon lens
The optical design of the Biogon lens has re-
sulted in unsurpassed performance for a
wide-angle lens. However, the short distance
between the rear lens element and the film
means that performance can easily be impair-
ed by even a trace of dust. So when cleaning
your lens, pay particular attention to the rear
lens element.
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