--- product_id: 100093350 title: "Donegan BR-303 Premier Series Round Optical Glass Reader, 8 Diopers, 3\" Focal Length" brand: "donegan optical" price: "$41.96" currency: USD in_stock: true reviews_count: 8 url: https://www.desertcart.us/products/100093350-donegan-br-303-premier-series-round-optical-glass-reader-8 store_origin: US region: United States of America --- # Donegan BR-303 Premier Series Round Optical Glass Reader, 8 Diopers, 3" Focal Length **Brand:** donegan optical **Price:** $41.96 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Donegan BR-303 Premier Series Round Optical Glass Reader, 8 Diopers, 3" Focal Length by donegan optical - **How much does it cost?** $41.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/100093350-donegan-br-303-premier-series-round-optical-glass-reader-8) ## Best For - donegan optical enthusiasts ## Why This Product - Trusted donegan optical brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description The Donegan Premier series magnifier is a hand-held magnifier that has a brass surround, a round lens with a wide rim, and is available in a variety of lens sizes, and multiple 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 fly-tying, jewelry-making, watch-making, needlework, 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) This handheld magnifier features a polished brass edge and trim with a wide rim around the lens to prevent scratching, and a walnut wood handle for aesthetic appeal. It has a round-shaped body with a wide rim to protect the lens surface, and has an extended handle for gripping. It has a round, optical-grade lens (available in a variety of sizes) that has been ground and polished into a prismatic lens, and is aspheric to produce a sharp image to the edge of the lens for less distortion. It is available in multiple magnification powers (X) at specified focal lengths, or distance from object. The magnifier weighs approximately 0.333 to 0.667 lb., 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?Premier series hand reader magnifierVinyl carrying pouchInstruction manual ## Features - About this item - Premier series hand reader provides magnification and viewing for a variety of applications such as dermatology, fly-tying, jewelry-making, watch-making, needlework, 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”) Polished brass edge and trim with a wide rim around the lens to prevent scratching, and a walnut wood handle for aesthetic appeal Aspheric magnifier produces a sharp image to the edge of the lens for less distortion ## Images ![Donegan BR-303 Premier Series Round Optical Glass Reader, 8 Diopers, 3" Focal Length - Image 1](https://m.media-amazon.com/images/I/41FkpIvy3-L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐ Sturdy *by B***K on Reviewed in the United States on November 19, 2012* Surprisingly sturdy. I've had several magnifying glasses of this general design and none of them were sturdy enough to not rattle during use and most had to be continually tightened. Not this glass. It has a very satisfying feel in the hand because of this sturdiness. The only downside is that it doesn't come with a case to keep it safe between uses. ### ⭐⭐⭐⭐⭐ The right stuff *by J***L on Reviewed in the United States on April 18, 2015* This is the kind of product that I enjoy owning. It's both functional: nice balance, no distortions or color tint, and it's also an elegant looking thing. Substitution of a wooden handle for the plastic one is the only thing that would make it better. Highly recommended for those that care about the color of things. ### ⭐⭐ NOT for the price *by J***S on Reviewed in the United States on September 3, 2013* Thought it was MUCH bigger (five inches)...guess I didn't look good enough at the specs. Appears well built, definately glass optics and nicely constructed right down to the handle. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/100093350-donegan-br-303-premier-series-round-optical-glass-reader-8](https://www.desertcart.us/products/100093350-donegan-br-303-premier-series-round-optical-glass-reader-8) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-06-03*