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Buying and Using a Jeweler’s Loupe

June 09, 2016

Buying and Using a Jeweler’s Loupe

Whether you’re a jeweler, rock collector, or a coin and stamp enthusiast, owning a quality jeweler’s loupe is essential to the enjoyment of your craft or hobby. In fact, many loupe advocates own multiple magnifiers so that they’re never without one when they need it. From the standard hand-held triplet, to the LED illuminated magnifier that fits conveniently in your pocket, there’s a jeweler’s loupe that’s perfectly suited to your needs, whether you’re at home or on the go.

Magnifier Basics

All magnifiers, loupe or otherwise, follow the same optical rules, and understanding the basics of how a magnifying lens works will go a long way to helping you choose the right loupe. These optical basics include:

  • Lens Magnification

  • Lens size

  • Focal distance

Magnification and Lens Size

The higher its magnification, the smaller a magnifying lens will be and vice versa. Since a lower magnification like 2-3X power provides a larger lens and viewing area, it’s ideal for activities like reading the text in a book or newspaper. But if you want to examine the fine details of a gemstone, stamp, or film negative, you’ll need the much smaller window that’s provided by a 10-20X magnifying loupe.

Focal Distance

Along with its smaller lens size, a magnifier with a higher magnification is also limited to a shorter focal distance. The focal distance of a magnifying lens is simply the distance between the lens and the object you’re viewing, when it’s in focus. Because of this, a jeweler’s loupe must be held quite close to the item you wish to examine – often no more than an inch away – in order for it to be effective.

How Does a Loupe Differ from other Magnifiers?

What makes a loupe different from other magnifiers is the fact that it’s designed to be held close to both your eye and the item you’re viewing when you use it. But in contrast to the old-fashioned monocle loupe that’s held in place by the muscles surrounding the eye socket, today’s consumer can choose from loupe styles that feature built-in stands, fit on a key ring, or that conveniently incorporate a second, lower magnification lens designed to serve multiple viewing purposes.

With its relatively high magnification of 10-20X, the lens quality of the typical jeweler’s loupe becomes extremely important, since any distortion or blurriness around the edges will be that much more evident and distracting. For this reason, better quality loupes are fitted with a multiple lens element, most commonly made up of three lenses fused together and known as a triplet. The visual correction that’s provided by a triplet helps to greatly reduce any optical aberrations, and gives the viewer a much clearer and more accurate image than a single lens can generally offer at such high magnifications.

Ideally, you should look for a magnifying loupe that’s both lightweight and portable, that has a minimum 10X magnification triplet lens, and that features a durable frame construction. The optional feature of LED lighting can also give you a definite advantage when it comes to smoothing out the viewing area, and when using your loupe in dimly lit environments.    

Making the Most of Your Jeweler’s Loupe

Once you’ve chosen a good quality jeweler’s loupe, you’ll get more value from it if you take the time to learn how to use it properly. Many people use their loupes incorrectly, and inadvertently short-change themselves because they’re not seeing all the detail they could be seeing.

To make the most of your magnifying loupe, be sure to follow these simple steps:

  1. For the most effective viewing experience, get in the habit of initially holding your loupe equal distance from both your eye and the item you’re examining – ideally, with about an inch on either side of the lens.

  2. Focusing with a jeweler’s loupe can take a bit of practice. Once you’ve found the sweet spot for bringing the surface of a gemstone into sharp focus, for example, slowly moving the stone closer to and further away from your loupe will allow you to examine its internal details more easily.

  3. Bracing both yourself and your loupe to prevent any wobbling is crucial to maintaining a consistent and stable level of focus. Rest your arms on a hard surface, such as a desk, and rest the loupe against your cheek or nose to help you to keep a steady hand.

  4. The more you use your loupe, the more you’ll begin to see and the better you’ll get at effectively zooming in on an object’s fine details.

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