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and then experiment. The Small, Medium and
Large screens work by refracting light rays up-
wards, while 10˚ and 20˚ correction screens work
by refracting light rays downwards. Refer back to
figs. 8 –12 for an illustration of the effects. A down-
ward shift requires the light to be refracted up-
wards. A positive tilt requires the light to be re-
fracted downwards. A combination of the two
however may create another situation which re-
quires another solution. Of course when the cam-
era is turned on its side or inverted then the screens
must also be inserted at 90˚ or 180˚ to follow the
underlying principles. As an example, fig. 15 dem-
onstrates two camera set-ups requiring different
solutions.
Remember to handle and store the screens with
care.
(General rules for 4.5/35 mm and 4.5/45 mm
lenses only)
Correction slide– SMALL
For use when the amount of shift is no greater than
ca. 5 mm.
Correction slide– MEDIUM
For use when the amount of shift is no greater than
ca. 5 – 15 mm.
Correction slide– LARGE
For use when the amount of shift is greater than ca.
15 mm.
These lenses require that one of the screens should
be in place at all times.
(General rules for 4.5/75 mm only)
Correction slide 10˚
For use with moderate amounts of shift and tilt.
Correction slide 20˚
For use with large amounts of shift and tilt.
This lens does not need any correction slide with
small amounts of movement.
In all cases, insert the correction
screens with the inscription visible
when viewed from behind the camera.
Stray light protection slide
only)
When no movements are used and therefore no
correction slide fitted, then the stray light protec-
tion slide should be fitted to ensure a clear image. It
is inserted in the slot in the focusing screen adapt-
er, either from the left or from the right.
Viewfinders
All viewfinders in the Hasselblad system will fit the
focusing screen adapter. They are simply slid down
into position for attachment and upwards for re-
moval when the ArcBody is in the normal position.
They are automatically secured in place by a catch
on the focusing screen adapter that must be de-
pressed for removal. An additional -1 dioptre cor-
rection is recommended when a standard
Hasselblad focusing hood is used. The recom-
mended reflex viewfinder for the ArcBody is the
Hasselblad reflex viewfinder RMfx (72530) that
provides both a vertically correct image and a com-
fortable working position. As it can be fitted 'in-
(N 4.5/75
16
31
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