- Pocket magnifier provides magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, fly-tying, electronic inspection, book-reading, print inspection, and stamp-collecting
- Available in multiple dioptric strengths that provide a specific magnification power (X), depending on the distance from the object (focal length)
- 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 8")
- Double, round lens system that slides into case for storage, and fits in a trouser pocket or a purse
- Durable, dustproof, plastic, round case that slides open for use as a handle, and clicks closed to protect the magnifier when not is use
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Donegan Magna-Pak Double Folding Pocket Magnifier
|Price:||$9.99 - $11.48|
|Brand Name||Donegan Optical|
The Magni-Pak pocket magnifier has double monocular, round, ... See more product details
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The Magni-Pak pocket magnifier has double monocular, round, optical-grade, prismatic lenses, and is available in multiple magnification powers (X) at a variety of focus lengths (distance to object), and comes housed in a sliding, protective, plastic case. 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.
The Magni-Pak magnifier features a durable, dustproof, plastic, round case that slides open for use as a handle, and clicks closed to protect the magnifier when not in use. The magnifier has a double, round lens system that has two lenses that tuck into a case for storage, and fits in a trouser pocket or a purse. A round, monocular lens is housed by a round-shaped plastic, protective perimeter for durability. Its optical-grade lens has been ground and polished into a prismatic lens for clarity. It weighs 2.67 oz., and 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 8”). 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 total magnification.
Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or - D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, needlework, artwork, fly-tying, electrical inspection, reading, print inspection, and stamp-collecting.
Donegan Optical manufactures and distributes precision visual devices for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas.
What’s in the Box?
- Magni-Pak magnifier with double lens system
- Carrying pouch
- Instruction manual
Top Customer Reviews
But the product description implies that the lenses are of good optical quality. I don't find this to be the case. The lens is approximately 1 5/8 inches in diameter but most of that is not usable be cause of a distortion in the lenses. Magnification is stronger toward the edges, weaker in the middle. If you are looking at a page of fine print, as you move magnifier across the page, the lower lines moves up, higher lines move down, and the center line seems to move in and out near the center. This may be "pin cushion" distortion, but I am not sure. If you are viewing something near the center of the lens at near max magnification, the edges are blurry.
I have had both more expensive and cheaper lenses and none of them had this problem. Buyer beware.
This is much better construction than the V series three-lens model. Lenses are good optical glass, housing is decently made but thinner than the that of similar B&L magnifiers.