How To Parfocal Your Stereo Zoom Microscope

 

 

Setting up a stereo microscope properly so that image being viewed is parfocaled during the entire zoom range is important to avoid headaches, stressful eyes and fatigue. To do so focal the steps below:


1. Turn the diopter adjustment rings of both eyepieces to position zero.

2. Put a specimen such as a coin on the base or stage plate

 

3. Turn the zoom adjustment knob to the lowest magnification

4. Rotate the focus adjustment knob to bring the specimen into focus

 

5. Turn the zoom adjustment knob to the highest magnification

6. Rotate the focus adjustment knob to bring the specimen into focus

7. Turn the zoom adjustment knob to the lowest magnification.

 

8. Rotate the diopter adjustment rings of the left and right eyepieces to bring the specimen in focus

9. Turn the zoom adjustment knob to the highest magnification and check the image focusing.

 

 

The stereo microscope should now be parfocaled. The image should in focus through the complete zoom range, ie from high to low and low to high

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