Donegan Lp-7 Replacement Lens Plate For Optivisor, 2.75x Magnification, 6" Focal

US $62

US, United States
May 29th

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Donegan LP-7 Replacement Lens Plate For OptiVISOR, 2.75x Magnification, 6" Focal Length CLICK TO ENLARGE Donegan LP-7 Replacement Lens Plate For OptiVISOR, 2.75x Magnification, 6" Focal Length DESCRIPTION This is a brand new: Donegan LP-7 Replacement Lens Plate For OptiVISOR, 2.75x Magnification, 6" Focal Length The Donegan replacement lens plate for the OptiVISOR hands-free, headband binocular magnifier, has an optical-grade, acrylic lens ground and polished into a prismatic lens, and is available in multiple dioptric strengths which provide specific magnification power (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, knitting, artwork, electronic inspection, book-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) The OptiVISOR replacement lens plate is made of a durable plastic material. It is constructed to interchange in and out of the OptiVISOR body with ease. The replacement lens plate comes housed in a protective carrying case, 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, electronic inspection, needlework, artwork, 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? Replacement lens plate for OptiVISOR magnifier Fitted carrying case Instruction manual - Replacement lens plate for use with OptiVISOR magnifying visor (sold separately) - Provides 7-diopter (2.75X) magnification - Optical-grade acrylic prismatic lens for improved focus and reduced eye strain - 6" focal length for a variety of uses - Made in USA This spec. is only relevant for this item: Donegan LP-7 Replacement Lens Plate For OptiVISOR, 2.75x Magnification, 6" Focal Length Shipping Return Payment Feedback Contact Us Domestic Shipping: All Domestic packages are shipped Ground Shipping For Free (Unless other shipping method was selected on the order) - We are now shipping to worldwide addresses, the item is sent to a logistic center in KY and shipped from there to the rest of the world - International customers are responsible for all duties and taxes - Contact your local authority for questions related to the amount of duties or taxes you will be responsible for - We ship within two business days of payment, usually sooner - Standard FREE shipping takes between 3-5 business days - We use a selection of shipping services such as UPS, FedEx, USPS etc. - Expedited shipping takes between 2-3 business days - Overnight shipping takes between 1-2 business days (Ships within 12 hours of payment) - We do not accept P.O. BOXES -PLEASE PROVIDE A PHYSICAL ADDRESS - Shipping this item: Donegan LP-7 Replacement Lens Plate For OptiVISOR, 2.75x Magnification, 6" Focal Length - In the event that you would like to return your purchase, we allow returns that are processed within the defined return date (the return date is to be found in the return policy/shipping and handling section) Please contact us for a return authorization and the return shipping address. - Please contact us for a Return Merchandise Authorization (RMA) number - We advise you to use a reputable carrier service when returning your goods. Please pack all returns appropriately. PayPal is our preferred method of payments it's the quickest, easiest and most secure way to pay for your goods or services online. PayPal offers buyer and seller protection should there be a problem. If you do not have a PayPal account, to get started and buy your first item with us is very easy. 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