The 20x power magnification provides a nice level of magnification, good depth of field (the area that appears in focus on an object having an irregular surface like a rock or mineral). The lens glass isn't as large, wide, as the famous BelOMO 10x Triplet Loupe Magnifier but there's still lots of light for a very bright view when you need or want just more magnification than the BelOMO 10x Triplet Loupe Magnifier .
The housing and cover are coated with a matte black finish and assembled using flathead screws. Screws allow you to adjust the swing tension to your liking. Belarusian Optical and Mechanical Association (BelOMA), makers of sights for guided weaponry, camera lenses, and other optical components manufacturers these loupes.
The BelOMO loupes are the loupes we always use though it's the 10x that we typically carry in the field. The 20x has a more magnification with a good field of view. But the magnification is just too much for the field.
Magnification ratio 20 times Lens diameter: 0.69 inch (18mm) Linear field of view: 0.28 inch ; (7mm) Focal distance: 0.44 inch (11mm) Overall dimensions: 1.54 x 1.1 x 0.98 inches ; 36 x 28 x 25 mm Weight, once: 2.1 ; kg: 0.06