Polaroid SX70 manual Optical System, Exit Pupil Test

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