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Depth-of-field ░22░
Depth-of-field – the amount of acceptable sharpness
produced at a given aperture and focus setting – can be
calculated as in the following example:
The aperture has been set at f/11 and the focus at 3
metres. By reading across from the relevant aperture
markings on the depth-of-field scale on either side of
the central index to the focusing distance scale, you
can see the extent of the sharp zone. In this example
the depth-of-field ranges from approx. 2m to 7m.
There are two tables at the end of the illustration section
of this manual that describe the depth-of-field produced
by the various combinations of aperture settings and
focus settings regarding 45mm and 90mm lenses. For
example, when focused at 2m and set at f/8, the depth-of-
field extends from 1.61 to 2.66m with the 45mm lens and
from 1.89 to 2.13 with the 90mm lens. See separate user
manual for 30mm depth-of-field table.
Viewfinder
The viewfinder is a coupled rangefinder type with
the additional feature of automatic field-of-view
frame change according to the focal length of the
lens and chosen format. The field-of-view frame
also moves automatically to compensate for
parallax error when photographing close subjects.
The 90mm lens produces a larger rangefinder
double-image compared to the 45mm lens. The
viewfinder eyepiece is interchangeable to suit
individual eyesight.
Changing the viewfinder eyepiece ░23░
The standard dioptre of the viewfinder eyepiece is -1.0.
Five other strengths are available: +2D, +0.5D, -2D, -3D
and -4D. The eyepieces simply slide in and out of the
viewfinder frame, clicking into position and secured
by the locking device. Pushing the locking device but-
ton and simultaneously sliding the eyepiece from its
locked position can release it.
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Please refer to the 'Viewfinder eyepiece selection' table
towards the end of this manual for a detailed description
of choice.