In ordinary situations, the open aperture light reading is more convenient as it enables
bright viewing of the subject area and also effectively provides against inaccuracy of
light measurement resulting from strong backlight entering through the viewfinder
eyepiece. Nevertheless, closed aperture light reading is necessary in photomicrography
or when using lenses of undeterminable f-number.
The method of closed aperture light reading is identical with any type of lens used.
1. Adjust both the lens selector dial and diaphragm setting lever of the camera to f/1 .4.
2. Stop down the lens to the required aperture and match the needles by turning the
shutter speed dial.
3. Take every precaution against backlight entering from the viewfinder eyepiece.
Because the light transmitted through the lens in case of closed aperture light reading is
often weaker than the backlight, error in exposure reading is liable to occur. To prevent
errors in light reading, therefore, the use of the eyecup is recommended.
4www.butkus.org
6. Partial Average System
The
Sensing area of the CdS meter of the Miranda Sensorex is placed behind
the mirror in alignment with the optical axis of the lens in use, always in
position for exposure reading, except for the split second action of the
mirror when taking a picture.
The exposure meter measures an average of a part of the
image, eliminating the light-influence of the sky, which could
cause over exposure of the picture, especially when color film
is used. This light-measuring is performed in a unique way.
The single CdS-cell, behind the mirror, in actual fact is
composed of 3 separate super sensitive light measuring
elements, positioned in the upper portion and left and right
side of the mirror.
As the mirror is placed in the camera at a 45 degree angle,
the reflected image in the viewfinder covers the area as
shown in the pictures. When photographing it is therefore a
prerequisite to have the main subject in the area, covered by
the exposure meter,
7. Convenient, Efficient Cross Coupled Match-Needle System
The CdS meter incorporated in the MIRANDA Sensorex is of the match - needle type permitting speedy, accurate light measurement. It
is moreover cross-coupled to the shutter and diaphragm mechanisms. By looking through the viewfinder, you can see at a glance whether
the prevailing light is sufficient to guarantee correct exposure without extra adjustments. Moreover, since the meter is cross-coupled, light
reading can be done through pre-selection of either the shutter speed or lens aperture, depending on the method preferred by the user.
· Aim the camera toward the subject and while looking through the viewfinder turn the shutter speed dial or diaphragm setting lever until
the follower needle (with 0 on the tip) coincides with the meter needle. This simple procedure enables accurate light measurement.
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