Donegan DA-2 OptiVISOR Headband Magnifier, 1.5X Magnification Glass Lens Plate, 20″ Focal Length
- Shipping Weight: 8 ounces
- Domestic Shipping: Item can be shipped within U.S.
- Item model number: 633096000472
- Headband binocular visor with snap-in 1.5X magnifying lens plate for hands-free viewing
- Ground and polished glass prismatic lens for improved focus and reduced eye strain
- Visor size-adjustment knob for customized fit
- Visor tilts out of way when not needed
- 20″ focal length for a variety of uses
Size: 1.5x Magnification, 20″ Focal Length The Donegan OptiVISOR is a hands-free, headband binocular magnifier that hasoptical glass lenses that are ground and polished into prismatic lenses forquality and clarity, and is available in multiple dioptric strengths(indicated by the number in the model) which provide specific magnificationpower (X) at specific focal lengths, or distance from object. This magnifierenhances the size and resolution of an object or image, and is commonly usedfor 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 havebeveled edges that are mounted in an interchangeable plastic frame. Anadjustable headband with padded leather comfort band conforms to a variety ofhead sizes and provides comfort for hours of continuous use. It can be wornover prescription or safety eyeglasses. A durable, plastic visor tips up abovethe forehead when not in use. Spring-loaded pivot screws hold the headband ina raised or a forward-facing position. The magnifier weighs 0.67 lbs., andcomes housed in a protective shell and carrying case. It has a one-yearlimited warranty. Diopter (D) is a technical term for the measurement of the light curvature andthickness of a lens. A dioptric number and a magnification number are not thesame thing. Diopter strength represents a specific magnification power (X).For example, a 5-diopter provides 2.5X magnification (at a distance of 8″).See the magnification chart. The higher the diopter, the more magnification alens can provide. As magnification increases, distance to the object (focallength), 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 oran eye loupe, must be added to the dioptric strength of the magnifier tocalculate total magnification. Magnifiers are devices used to enlarge the visual appearance of an object orimage. 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 fitin a trouser pocket. Magnifiers are commonly made of plastic or glass. Theycan have one or more lenses with varying magnification abilities, and can havea binocular configuration with a single lens, or two separate lenses. They aresometimes used with LED or fluorescent light sources to help control viewingcapabilities. Magnifier ability is often expressed as magnification at aspecific length. For example, 1.75X at 14″ means that when a magnifier is heldat 14″ from a viewer’s eyes, the object will be magnified 1.75 times (X) itsactual size. As magnification increases, viewing areas and focal lengthdecrease. Magnifiers sometimes have a diopter number, expressed as + or -D,which is a measurement of strength (or power) of the lens. Some magnifiers aremarked with a dioptric number on the lens. A high diopter number has a highermagnification than a low diopter number. Aspheric magnifiers, unlike sphericmagnifiers, 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 20/20 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 forhobbyists 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 Fitted, plastic, carrying case Instruction manual
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