Polaroid 600SE

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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 Xmax Xmax
127mm 0.039 inches (1/32) 1mm
150mm 0.078 inches (5/64) 2mm
75mm 0.090 inches (3/32) 2.3mm
Best Loupe Focus
Image Coincidence
X