Optical System; Exit Pupil Test; Viewfinder System View - Polaroid Land SX-70 User Manual

Figure 3-11 SX-70 Viewfinder system
D. OPTICAL SYSTEM
Viewfinder quality refers to the general quality and
alignment of the camera optics. For the user, it
can be precisely defined as the appearance and
clarity of the image as seen through the viewing
system (Figure 3-11). When a camera has poor
viewfinder quality, it is difficult to obtain a sharp
image.Certain parts of the field always seem out
of focus and the image lacks crispness, having
a hazy appearance usually in the vertical plane.
Since flash pictures are critically dependent on
accurate focusing, a poor viewfinder system will
make the taking of good flash pictures difficult.
Failure Analysis Chart #5 will enable you to trace
most problems in the viewing system to their
source. Corrective actions are shown and where
they are complicated are presented in Section IV.
Presented here are several checks with require
greater detail than the charts provide.

1. Exit Pupil Test

a. Mount the exit pupil gage onto the camera eye
lens (Figure 3-12).
(1) Engage the left side gage rail on the eye
lens. (The right side is identified by a 3/4''
horizontal slot.)
(2) Slowly slide the right side in place. A distinct
«clicking» will be heard when the gage is
secure.
Figure 3-12 Installing the exit pupil gage