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d. Move the camera to the aiming and framing target as shown in Figure 5-10.
Look through the viewfinder eyepiece. Adjust focus until the images of the tape line
coincide. Mark the distance scale.
e. Look through the focal plane loupe. Slowly adjust the lens until the sharpest image is seen.
Mark the distance scale.
f. Measure the tracking discrepancy at near distance by using a ruler or other measuring
device to measure gap between marks (d. and e. above) on distance scale. The
discrepancy cannot exceed limits listed in Step 4. Adjust lens to reduce error.
g. Return to the infinity tube and move the focus back to infinity. The minimum reading must
be 40 lines/mm.
h. When the image seen through the lens loupe is sharp at both infinity and near distance
position, lock the front lens lock ring.
Secure the front lens to the mount by applying three drops of shellac at equidistant points
around the lens. DO NOT DRIP SHELLAC ONTO THE LENS.
7. Perform any necessary rangefinder/viewfinder adjustments, after this lens collimation has been
completed.
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