It is a necessity for working with diamonds and is the type of lens required in most professional evaluations of authenticity and condition for a variety of antiques and art.As you raise your hands, bring the fleshy parts of your palms, the heels, together (Fig. The higher the power of magnification, the shorter the focal length and the shorter the depth of field. The watch’s multi-level,three-dimensional movement is visible through the dial side, and is among themost spectacular movement architectures I’ve ever seen.Stepping up in cost, “doublets” and “triplets” combinemultiple lens elements to correct the aberrations found in a single lens.Doublets, combining two lenses, correct for spatial and chromatic (color)inaccuracies, but have poor optical performance along the outer circumferenceof their field of view. He setout to create his own, designed specifically to meet his demanding standards.His research led him to a camera lens design from the 1980s employing five multi-coatedlenses arranged in three groups. Now brace your elbows against the sides of your body and bring both your hands up towards your face (you may brace your elbows on a desk or table top if you are seated).You hold a watchmakers loupe between your thumb and forefinger (Fig. For occasional use, it is more practical to hand-hold a loupe rather than learn to hold it in your eye like a monocle. The world’s first loupe designed from the ground up specifically for watch enthusiasts, the Loupe System promises to be the “best hand-held loupe you have ever looked through”. The price of linen testers is usually less than comparators. Whether one collects vintage or modern watches, a loupe isessential for magnifying important and subtle details that allow a collectorto:Attempting to purchase a vintage or pre-owned watch withoutone is basically begging for financial disaster.Straight lines found within the movement and its printedtext and engravings appeared undistorted and crisp throughout the LoupeSystem’s entire field-of-view, illustrating the accuracy of the 5-element lenssystem.Expressed as a power multiplier such as 10X, 12X, or 15Xrelative to the original object size, higher magnification levels reduce boththe depth-of-field and the field-of-view, resulting in a darker image with anarrow focus region. Once you find a suspected area (especially in repairs) you can always proceed to higher powers of magnification to investigate more closely. For less than the retail price of some luxury watch straps, it’s highlyrecommended.Measuring 45 mm high with a diameter of 48 mm, and weighingin at 125 grams (just under 4.5 ounces), the Loupe System’s high qualityconstruction is consistent with its superior optics. Next,a loupe with a sufficiently long depth-of-field – the distance between theclosest and furthest items that are in focus – greatly simplifies the processof getting various areas of interest in focus. Most linen provers fold flat for easy carrying; many comparators are mounted in rigid frames which can not be folded.You will avoid eye strain by keeping your free eye open during an examination. Lenses used for inspecting color printing and printed circuitry are fully corrected; lenses used for photo retouching and textiles may be distortion free but not color corrected. Decals can be distinguished from hand painted brush strokes, flaws in gemstones can be spotted and marks and signatures can be examined for authenticity.Most diamond loupes are designed with a barrel shaped lens holder that swings in and out of a protective metal housing. From the surface of the timekeepinghands at the top, to the movement’s main plate at the bottom, I was able toadmire the superb finishing throughout the entire movement without having toreposition the lens in any way. But if you begin with a high magnification, you may miss details which are out of focus due to the shallow depth of field.EXAMPLE (A): You are looking along the teeth of a comb with a lens that has a 5" focal length. The use of better quality, coated lenses improvesresolution, corrects for spatial distortions, and displays accurate colors.The Loupe System is thoughtfully packaged, shipping with atough, waterproof ABS plastic case that transforms into a four-watch paddedtravel case via included foam inserts. Low powered lenses have surfaces with shallow curves; the surfaces of high powered lenses curve more sharply.Increasing the power of magnification does not necessarily make an object easier to see. If your particular field of interest requires very precise measurement (say in hundredths of an inch) you may want to consider a comparator.
9 & 10). If you can get by with accurate measurements to the nearest 1/16 or 1/32 of an inch, a good quality linen tester with markings on the frame should work fine. As the name suggests, this loupe was originally used to pick up, inspect and work with small parts of clocks and watches. Surprisingly, higher magnification is undesirable for awatch collector’s loupe.Yes, the Loupe System is expensive relative to otherhandheld loupes available on the market.
Hand holding a loop also means you do not have to remove eyeglasses if you wear them. The power of magnification depends on the curvature of the lens surface.

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