Ranging Optics - Recent Questions, Troubleshooting & Support
I have a ranging 100
I just got one complete with manual and original box. It was not working, so I disassembled it and repaired the internal mechanism and recalibrated it for distance and vertical image coincidence.
Disassembly is easy (two screws at front and rear) and the "repair" for mine was to lubricate two pads that the mechanism rests on that were "sticky." I removed the mechanism, but that is not required -- just manual manipulation of the distancing arm should be sufficient to expose the lubrication points. Do not use 3-in-One or similar oil -- that thickens with time. Lacking the "proper" oil type (watch maker's), I would use a small drop of motor oil.
Calibration is simple -- use an object with a known distance that is about half the range of your unit. Adjust the "focus" knob to make the two images coincide (don't worry about vertical coincidence yet). Hold the thinner of the two distance adjuster knobs and turn the thicker one until the tape displaying the distance reads the actual distance to the known object. I would then adjust the image coincidence vertically by turning the screw on the bottom of the unit on the right (near the loop for a lanyard). It will be stiff! Turn it about a quarter of a turn and recheck vertical image coincidence -- if worse, turn it back the other direction a half-turn. Repeat with small turn increments until the images coincide vertically. Once that is done, recheck the distance calibration.
Do not know how to operate
First, be sure and focus the eyepiece on what you desire to measure distance to. Begin the measurement with the range dial set to minimum. Slowly tury the dial until the grey-blue image and the yellow image overlap each other. Read the measurement. If you suspect it is in error, you can calibrate the 400 or 1000 or 1200 by turning the screw slot within the range dial using an object you know the distance to. If the two images are off in the vertical direction, there's a screw below the range finder to adjust that. Turn it very little. Regarding the model 610, mostly the same except to calibrate it, merely spread the adjustment knob apart (spring loaded) and turn the part of it nearest your eyes so the yardage matches the distance.
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