The flip-up hinge tension can be adjusted. The vertical adjustment hinge should be secured after setting up the loupes.
Specifications:
Magnification 3.5X
Working distance* 340mm (290-390 mm)
Depth of field 50mm
Field of view 55mm
Weight 52 gr
*The loupes will provide a sharp image at the Working distance +/- the Depth of field.
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