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on all Hasselblad equipment, is an innovation in
image brightness and clarity, even in poor light
conditions. These effects are naturally slightly di-
minished when shift or tilt are applied as they de-
pend on the film plane remaining parallel to the
lens plane and in line with the lens axis. Correction
slides are supplied which simply and rapidly return
the image to virtually the original quality. They are
easy to fit and extend the working range of the
Hasselblad ArcBody even further.
In fig. 8 you can see that when the image plane is
parallel with the lens plane and in line with the lens
axis then full effect is achieved and a bright, clear
image is produced.
In figs. 9,10 movements – shift and tilt respectively
– without correction slides create loss in image
brightness as the light rays are not in line with the
viewing axis.
Figs. 11,12 demonstrates that when the correction
slides are in position, the light rays are re-directed
towards the eye axis and therefore cause a return in
full image brightness.
The image is composed on the focusing screen,
with or without a hood or reflex viewfinder. The
focusing screen adapter is removed and exchanged
for a Hasselblad film magazine for exposure.
The focusing screen adapter
Rest the focusing screen adapter on the ArcBody's
magazine supports ensuring that it is properly lo-
cated. Carefully swing it towards the ArcBody,
checking that the upper support hooks on the cam-
30
era body fit into the slots in the adapter. Push it
against the hooks while depressing the focusing
screen adapter release catch.
To remove, depress the focusing screen adapter re-
lease catch and swing the top of the adapter back
away from the camera body while lifting it off the
lower supports.
Fitting correction slides
Correction slides are chosen and inserted accord-
ing to the lens and movements used. The basic dif-
ference is that the 4.5/35 mm and 4.5/45 mm
lenses use the Small, Medium and Large correction
slides exclusively whereas the 4.5/75 mm lens uses
the 10˚ and 20˚ correction slides exclusively.
As each combination of lens/amount of movement/
direction of movement differs in requirements, it is
not possible to mention every eventuality. There
will always be cases where these requirements
overlap so a general understanding of the system
provides a better basis for correction screen choice.
Correction screens provide an improvement in the
image as seen on the focusing screen; they have no
effect on the image on the film plane. This means
there is no risk involved in using the 'wrong' screen
or using a screen the 'wrong' way.
The screens are simply inserted into the slot in the
13
focusing screen adapter, only one screen at a time
being used. They may be inserted from the left or
the right but always so that the text can be read
when viewed from a position behind the camera,
fig 14. Look at the lists below for a starting point
14, 15
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