BelOMO 20x Quadruplet Loupe Folding Magnifier, Optical Glass with Anti-Reflection Coating

First, a 10x lens is the most popular and best power for a handheld magnifier. The BelOMO 20x 17.5mm (0.50'') Qaudruplet Loupe Magnifier has a viewing area of 0.28" (7mm), much larger than the Bausch & Lomb Hastings Triplet Magnifier. The 4 elements making up this quadruplet provide a bright, and clear view. The housing and cover are coated with a matte black finish and assembled using flathead screws. Make sure your authorized BelOMO loupe dealer custom treats the screws to prevent them from working loose during normal usage. Belarusian Optical and Mechanical Association (BelOMA), makers of sights for guided weaponry, camera lenses, and other optical components manufactures these loupes. The high quality optical lens of each loupe is tested and certified, just like a camera lens. The 20x power magnification provides the strongest magnification recommended in a hand held magnifier. While all 20x power magnifiers provide LOTS of magnification you'll find depth of field (that amount of vertical relief that appears in focus) very small making this much magnification very hard to use. That's a trade off and why we seldom recommend so much magnification unless you have a specific need. Imagine viewing an example quarter that's 20'' wide and you're looking at it through a 1/4 inch in diameter hole. Now the quarter is 20'' wide but you can only see 1/4 inch at a time. That's a 20x power loupe. !!!!!!!!!!!! WARNING: EXTREME MAGNIFICATION. LIMITED DEPTH OF FIELD. MUST HOLD AT THE EYE SO IT ALMOST TOUCHES. OBJECT MUST BE WITHIN 3/8 INCH OF FRONT OF LENS. HOLD "MADE IN BELARUS" SIDE TO EYE. THE SHALLOW DEPTH OF FIELD MEANS ANY 20X OR STRONGER LOUPE CAN NOT BE USED FOR INSPECTING DIAMONDS OR GEMS. YOU REACH THE LIMIT WHEN THE LENS TOUCHES THE GEM!!!!!!!!!! 18 month warranty on BelOMO magnifiers sold by authorized US dealers. Gray market or counterfeit loupes are not covered by warranty.