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Stereo Zoom 4

Adjusting the Baush & Lomb StereoZoom 4 Microscope

What is most often out of adjustment on the SZ4 (Stereo Zoom 4) is the zoom focus: if everything is correct when you are in focus at maximum zoom the scope should stay in focus as you zoom back out.

To accomplish this you'll need a jeweler's screwdriver to loosen the locking screw on the right eyepiece. This set screw seems to be a very small cross point (which I don't have - I used a regular jewelers screwdriver - be very careful not to strip the screw head ).

Loosen the Right eyepiece locking screw

Cover the left eyepiece so you will only look with the right eyepiece
Focus on sample at highest magnification
Turn zooming knob to lowest magnification.
With out turning focus wheel try to get sample in focus by only turning the right eyepiece. (If sample will not come in focus by this method the internal optics of scope will have to be adjusted. (if you have info on this please send it along).
Go to step 3 and repeat until no improvement.
Tighten the left eyepiece locking screw and test that the zoom stays in focus.
Now focus again and uncover the left eyepiece and cover the right one.
Adjust the Left eyepiece for best focus.

The only other adjustments (interocular distance, focus) are self evident.

The two clips on the side that were a bit of a mystery. They are the retaining features that keep the scope body seated firmly in the base ring. If you swing those clips out, the scope body can be removed. They are kept in place via interference between a stamped dimple on the clip and a recess in the ring.

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