Manufacturer: Donegan Optical
Brand: Donegan Optical
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The Donegan aspheric, lighted pocket magnifier has an acrylic, monocular, optical-grade lens that has been ground and polished into a prismatic lens, and is available in multiple lens widths, and magnification powers (X) at specified focal lengths, or distance from object. This magnifier enhances the size and resolution of an object or image, and is commonly used for a variety of applications, such as jewelry-making, watch-making, needlework, artwork, electronic inspection, fly-tying, book-reading, print inspection, and stamp-collecting. This aspheric, lighted pocket magnifier features LED lighting to reduce eyestrain and control brightness. An aspheric lens produces a sharp image to the edge of the lens for less distortion. The magnifier is small enough to fit in a trouser pocket and purse. It has a rectangular body for gripping and holding that has a large, raised switch to activate lighting. A round, monocular lens with a plastic, protective perimeter is located on the end of the magnifier handle. The magnifier is available in a variety of magnification powers (X) with varying lens widths, such as: 8X with a 35mm lens, 10X with a 35mm lens, and 14X with a 30mm lens. It weighs 0.257 lbs., and comes housed in a protective carrying pouch. It has a one-year limited warranty. Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8â€). The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decrease. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate...