Buy Discount Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length Looking for Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length or other deals ? Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length Feature: Binocular headband magnifier provides hands-free magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collectingAvailable in multiple dioptric strengths (indicated by the model number) that provide a specific magnification power (X), depending on the distance from the objectA 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")Optical glass lenses are ground and polished into prismatic lenses for quality and clarityCan be worn over prescription or safety eyeglasses The Donegan OptiVISOR is a hands-free, headband binocular magnifier that has optical glass lenses that are ground and polished into prismatic lenses for quality and clarity, and is available in multiple dioptric strengths (indicated by the number in the model) which provide specific magnification power (X) at specific 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, book-reading, print inspection, and stamp-collecting. The OptiVISOR magnifier features replaceable binocular lenses that have beveled edges that are mounted in an interchangeable plastic frame. An adjustable headband with padded leather comfort band conforms to a variety of head sizes and provides comfort for hours of continuous use. It can be worn over prescription or safety eyeglasses. A durable, plastic visor tips up above the forehead when not in use. Spring-loaded pivot screws hold the headband in a raised or a forward-facing position. The magnifier weighs 0.67 lbs. 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€). See the magnification chart. 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) decreases. 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, reading, print inspection, and stamp-collecting.  Determining Magnification Diopter Magnification Focal length (Distance from object) Sample view 2020 vision 20 (50.8cm) 2-diopter lens 1.50X 20 (50.8cm) 3-diopter lens 1.75X 14 (35.56cm) 4-diopter lens 2.00X 10 (25.4cm) 5-diopter lens 2.50X 8 (20.32cm) 7-diopter lens 2.75X 6 (15.24cm) 10-diopter lens 3.50X 4 (10.16cm) 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? OptiVISOR Instruction manual Some tags cyber monday; tv deals; best deals; cyber monday; cheap; reviews on Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length; products; for customers; best Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length; black friday; offers; black friday; features; buy cheap; cheap; best buy; cyber monday sale 2013; cyber monday; uuue; reviews; specials; holiday; market price; christmas deals; shipping; top; holiday; special; bargain; best price. appkakjing24/cheap/?asin=B0015IP380 Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Compare,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Deals,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Discount,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Low Price,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Offers,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length OnSale,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Reviews,Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length Save, Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length CLICK HERE TO BUY LOW PRICE : bit.ly/19uoDWD
Posted on: Mon, 07 Oct 2013 02:42:47 +0000
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