Measuring Collimation Tracking Error At Infinity - Polaroid 600SE Repair Manual

Figure 5-6. Infinity-tube as seen through focal plane loupe
Figure 5-7. Measuring collimation tracking error at infinity
c. Measure tracking error by using a ruler or other measuring device to measure gap;
Xbetween marks on the distance scale of each lens. Tracking error = " X ", cannot
exceed the following limits:
Lens
127mm
150mm
75mm
Best Loupe Focus
Xmax
0.039 inches (1/32)
0.078 inches (5/64)
0.090 inches (3/32)
Image Coincidence
X
81
Xmax
1mm
2mm
2.3mm