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How to Select Magnifiers	Optivisor Lens Plates	Bausch & Lomb Loupes
Hearts and Arrows Loupe		Jeweller's Loupes
Optivisors	.	Watchmaker Eye Loupes

How to Select Magnifiers

Diamonds are graded for clarity at 10X. If a flaw in a diamond cannot be seen by a trained eye at 10X, the flaw does not exist for the purpose of grading clarity.
A 10X triplet loupe is the conventional jewellers' loupe. A triplet has three lenses which greatly reduce or entirely remove distortion and colour aberrations (depending on the quality of the loupe), compared to single lense or doublet loupes.
Magnifiers are also classified by working distance (focal length). A 10X loupe has a working distance of 1" which means the magnifier will be in clear focus when held 1" from an object.
The higher the power, the shorter the working distance,and the shorter the depth of field

More on How to Select Magnifiers
This information was obtained with permission from Grobet File Company of Canada.

Precision work routinely requires magnification to increase the visulal size of objects. As the eye comes closer to an object, the apparent size and detail in increased; however, the ability of the eye to focus correctly diminishes at distances closer than 10" (254mm). Use of a magnifier provides increased focusing power, resulting in the visual effect of a clearer, larger image of the object.

Four Characteristics of Magnifiers

Power of Magnification The ability of the lens to increase the visual size of an object. The symbol X (times) is used to identify this factor. A magnifying lens bends light rays resulting in an image that looks larger than the actual object. For example, a 3X magnifier triples the size of an image.
Working Distance ( Focal Length ) In addition to power, a magnifier will also be classified for working distance. The higher the power of a lens, the shorter the working distance (the distance between the object and the magnifier). For example, a 2X lens has a working distance of 5" (127mm), which means that the magnifier will provide double magnification and be in clear focus when held at a distance of 5" from the object.
Field of ViewThe size of the area that is seen through the magnifier. The field of view decreases as the power increases.
Depth of FieldThe distance that a magnifier can be moved from an object and still have the object in focus. The higher the power, the shorter the depth of field.

Corrective Magnifiers
Certain magnifiers have lens systems which correct optical distortion or aberration that might otherwise be present as follows:
Distortion Uncorrected lens will curve "straight lines" of light toward the centre.
Chromatic and Spherical Aberration Size and shape differences will occur in the image of an uncorrected lens. These aberrations are clearly noticable when viewing a matrix of dots of the same size.

Definition of Common Terms

Achromatic Lens: Lens that eliminates chromatic aberration.
Aplanatic Lens:Lens that corrects for spherical aberration and coma.
Chromatic Aberration:Inability of a lens to focus light of different colours at a point.
Coma: Blurry appearance around an object viewed through an uncorrected lens.
Corrected Lens: Lens system that corrects for distortions and aberrations to produce a sharp image.
Spherical Aberration:Lens defect that produces an image that lacks contrast.

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Hearts and Arrows Loupe

This loupe will show whether an Round Brilliant Diamond is perfectly cut. A symmetrical pattern of eight arrows will be seen when viewing a perfectly proportioned stone from the top - a symmetrical pattern of eight hearts will be seen when viewing the bottom. If the stone is not perfectly cut, the patterns will not be clear and symmetrical.

The Hearts and Arrows loupe is a valuable promotion tool for diamond sales, and it is portable.

1015 Hearts and Arrows Loupe $39.95

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Symmetrical Pattern of 8 Hearts.

Optivisors
Most popular head magnifier, comfortable headband, adjustable to fit any size. Prismatic lenses are ground and polished. Lens plates can be ordered separately.

DA2 Optivisor 1-1/2X, Working Distance 20" $39.95

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DA3 Optivisor 1-3/4X, Working Distance 14" $39.95

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DA4 Optivisor 2X, Working Distance 10" $39.95

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DA5 Optivisor 2-1/2X, Working Distance 8" $39.95

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DA7 Optivisor 2-3/4X, Working Distance 6" $39.95

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DA10 Optivisor 3-1/2X, Working Distance 4" $39.95

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Optivisor Lens Plates Only

LP-2 Optivisor Lens Plate for DA2, 1-1/2X, Working Distance 20" $29.95

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LP-3 Optivisor Lens Plate for DA3, 1-3/4X, Working Distance 14" $29.95

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LP-4 Optivisor Lens Plate for DA4, 2X, Working Distance 10" $29.95

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LP-5 Optivisor Lens Plate for DA5, 2-1/2X, Working Distance 8" $29.95

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LP-7 Optivisor Lens Plate for DA7, 2-3/4X, Working Distance 6" $31.95

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LP-10 Optivisor Lens Plate for DA10, 3-1/2X, Working Distance 4" $31.95

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LP1 Optiloupe $10.95
Fits on either side of optivisor and adds 2X to the magnification. Optiloupe attachment can be adjusted away from lenses when not in use.

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Watchmaker Type Eye Loupes
Inexpensive watchmaker's type loupe in black plastic holder. Good quality lens.

X10010 Watchmaker Type Eye Loupe, 10X, Working Distance 1" $4.95

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X07015 Watchmaker Type Eye Loupe, 7X, Working Distance 1.5" $4.95

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X05020 Watchmaker Type Eye Loupe, 5X , Working Distance 2" $4.95

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X04025 Watchmaker Type Eye Loupe, 4X, Working Distance 2-1/2" $4.95

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X03330 Watchmaker Type Eye Loupe, 3.3X, Working Distance 3" $4.95

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X03035 Watchmaker Type Eye Loupe, 3X , Working Distance 3-1/2" $4.95

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X02540 Watchmaker Type Eye Loupe, 2.5X, Working Distance 4" $4.95

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X02345 Watchmaker Type Eye Loupe, 2.3X, Working Distance 4.5" $4.95

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Bausch & Lomb Loupes

B&L Hastings Loupe 10X - Professional Jewellery Loupe

Triplet lens, high quality prismatic. Eliminates colour degradation and gives an undistorted wide view.
82900 B&L Hastings Triplet Loupe 10X $79.95

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B&L Coddington Loupes
Single Lens with a grooved diaphram around its circumference. High definition, distortion-free view. A black iris masks all distortion that would otherwise be discernable around the outside of the field of view.

83500 B&L Coddington Loupe 10X $49.95

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83700 B&L Coddington Loupe 20X $49.95

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Jeweller's Loupes & Magnifiers
These loupes are excellent for the price. There is some distortion at the extreme edge of the field of view, unlike the B&L loupes that have no distortion. Made in China. Not all colours are always available.

15 mm 10X Chrome Doublet $9.95

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20.5 mm 10X Triplet - Black, Blue, Green, Gold, Silver, Rose, Chrome $31.95

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20.5 mm 10X Triplet with Rubber Grip - same colours $39.95

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18 mm 10X Triplet - same colours $29.95

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18 mm 10X Triplet with Rubber Grip - same colours $36.95

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All Prices are in Canadian Dollars

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