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How to use and adjust loupes
Structure of loupes
This adjustment is controlled by turning the interpupillary adjustment knob back and forth, until the image converges into a circle.
For Kepler Loupes(4.0x to 6.0x), each optics can be independently adjusted until the image coverages into a circle.
Follow the drawing to adjust the hinge mechanism, so that the optics are angled approximately 30 to
45 degrees below a horizontal line. This will allow the user to look down into the optics while working,
while still allowing you to maintain an upright, ergonomic posture.