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a. Centering a lens using re-marked micro-engravings
Prerequisite:
remove all the original markings,
re-mark the micro-engravings with the marker; the diameter of points must be between 0.5 and 1.5 mm.
We advise you to use the white felt tip marker supplied with the tracer-centerer-blocker to mark the lens.
Centering the lens
Press to select the type of mid-distance lens.
Enter the half PD and the frame height.
Lower the tube.
Insert the posiblock and its pad in the centering device.
Raise the tube back into centering position.
Position the lens on the tube, with the convex side on the tube.
Move the lens slowly until the micro-engravings are:
The centering target is displayed:>
The target moves.>
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