Donegan DA-5 OptiVisor Headband Magnifier, 2.5x Magnification, 8 Focal Length Description
Size:2.5x Magnification, 8′ Focal Length 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., and comes housed in a protective shell and carrying case. 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 14â means that when a magnifier is held at 14â from a viewerâs 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. Â 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 for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas. Whatâs in the Box? OptiVISOR Instruction manual Product details Size: 2.5x Magnification, 8′ Focal Length Product Dimensions: 8 x 11.5 x 2 inches ; 8.8 ounces Shipping Weight: 8.8 ounces (View shipping rates and policies)Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.International Shipping: This item can be shipped to select countries outside of the U.S. Learn More ASIN: B0015IN8J6California residents: Click here for Proposition 65 warning.Item model number: 6.33096E+11 Average Customer Review: 4.5 out of 5 stars 1,075 customer reviews Amazon Best Sellers Rank: #4,427 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #2 inÂ Industrial & Scientific > Professional Medical Supplies > Durable Medical Equipment > Visual Impairment Aids > #57 inÂ Industrial & Scientific > Professional Medical Supplies > Durable Medical Equipment > Visual Impairment Aids > #64 inÂ Industrial & Scientific > Test, Measure & Inspect > Inspection & Analysis > Manufacturerâs warranty can be requested from customer service. Click here to make a request to customer service. Would you like to ? 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When you click on a Sponsored Product ad, you will be taken to an Amazon detail page where you can learn more about the product and purchase it. To learn more about Amazon Sponsored Products, click here. Customer Questions & Answers See questions and answers 1,075 customer reviews4.5 out of 5 stars4.5 out of 5 stars5 star78%4 star13%3 star4%2 star2%1 star3% Review this productShare your thoughts with other customersWrite a customer review Customer images See all customer images Read reviews that mention focal length headband magnifier hands free much better comfortable to wear well made works great reading glasses close work glass lenses years ago works well high quality detail work highly recommend much easier made in the usa donegan optivisor headband easy to adjust Showing 1-4 of 1,075 reviewsTop ReviewsMost recentTop ReviewsThere was a problem filtering reviews right now. Please try again later.Ken in Denver5.0 out of 5 starsPrescription Glasses, DA vs. XL/AL models, Lens Plates, OptiLoupe, Quasar LED Light, and Diopters vs. Magnification …June 10, 2016Size: 2.5x Magnification, 8′ Focal LengthVerified PurchaseDonegan vs. MagnifyLabs vs. Bausch & Lomb:The main decent quality choices seemed to be: Donegan Optivisor DA ($36 – glass lens – this review) or LX ($26 – acrylic lens), MagnifyLabs Headband Magnifier ($26 – glass lens) and less-known knock-offs, and Bausch & Lomb Magna Visor ($36 – acrylic lens). The Bausch & Lomb had too many bad reviews. The MagnifyLabs apparently has glass lenses like the Donegan DA and is cheaper and well-reviewed. But for only $10 more I preferred to go with the proven original – the Donegan DA. The headband has a huge adjustment range to accommodate a-n-y head size and is remarkably comfortable due to the padded forehead. The plastic adjusting size and flip-up tension knobs are hokey but they work.DA vs. LX / ALRegardless of misinformation by others, the Optivisor ‘DA’ models have the two-piece glass-lens-in-blue-tinted-plastic-frame lens plates, while the cheaper Optivisor LX (= AL lens) models have the single-piece-all-clear-molded-in-acrylic-lens-plate. No idea why Donegan chose to confuse things by using Optivisor ‘LX’ for the headband but ‘AL’ for the lenses. My box said ‘DA-5′ and I scratch-tested the lens – it’s glass.Prescription Glasses:You can wear your glasses with this – plenty of room – or no, as the lens acts like near-sight glasses anyway. I prefer to wear my normal prescription glasses with these since they correct both my eyes for crystal clear starting vision, with two interesting side effects: 1) the overall magnification is noticeably greater due to the magnification added by my glasses (great!); and 2) the focused working distance is reduced – for me for the 2.5x lens from the nominal 8′ to 5-6’. So if you wear glasses, consider this in your lens power choice, as your glasses will add more magnification themselves, plus reduce your working distance further than the nominal number claimed.Lens choice:For me, the 2.5x magnification lens (5 diopter) is perfect for general usage inspecting things like splinters, coins, golf club grooves, electronics, bugs, super-glueing very small stuff, etc., because it shows everything of possible interest while still allowing a comfortable 6-8′ distance from the work and a reasonably broad and deep field of view. This is as opposed to, say, the highest 3x magnification (10 diopter) which makes you work excruciatingly close at 4′ (or 3′ with glasses) and also with a narrower field and depth of view. With a 3x lens at 4′ you can’t even get your fingers in there to do anything – only for specific professional use. So I think most would find opting for a comfortable working distance more important than trading that off for any extra magnification. A modern car key is about 4′ long so try it – put a newspaper down and bend down until your glasses meet the car key and try to do anything in front of the lens. Plus you can just add a $10 OptiLoupe (see below) to a medium magnification lens for the rare times you want to scrunch down to 2′ to check out something further at 4-5x.OptiLoupe LP-1 ($10):I added the separate 2.5x OptiLoupe for the occasional super-close-up. The loupe mounts on either side you prefer – just pull the original lens mounting screw or pin out on that side and shove the OptiLoupe on with its longer screw in its place. The loupe lens was maybe glass at one time but it definitely is acrylic now (I scratch-tested it), but that seems irrelevant given the perfect clarity. You have to close the other eye when using the loupe, but that works fine. (You can’t use one for each eye because your eyes won’t focus properly through both together.) Assuming you’ll rarely need/use a super-close-up, this is a much better solution than having to switch a separate high power lens plate in and out of the headband. With my glasses on and this flipped down, the working distance is reduced to 2′ but the clarity is great.Quasar LS (Lighting System) model 6010 ($25) – not DoneganYou can see things with normal room lighting, but for serious views, actual detailed work, or long use, the more magnification, the more light required. The Quasar is very convenient – very bright lighting comes with you and I haven’t felt the need to add external light. To add it on, you pull the two original lens mounting plate screws out, slap the Quasar LED frame on the front of the lens plate, and stick both back on with the longer plastic pins supplied. Then you just place the battery pack on the side of the headband and strap it on with the supplied velcro strap. Simple on-off switch on the side of the battery pack. Unnoticeable when mounted. Takes 2 AA batteries that come with it (nice surprise – Energizer alkalines!). Batteries claim 100+ hours of life, which given LEDs, seems likely. Fyi, works with the MagnifyLabs headband also. Donegan offers the VisorLIGHT, a single non-LED bulb alternative but it seems pretty lame in comparison given 5 hour battery life, $10 replacement Xenon bulbs, and review quality issues.Additional/Replacement Lens Plates:This is extremely confusing because of the supplier misinformation as of June 2016. So I talked with the manufacturer Donegan. They confirmed they do offer both glass and acrylic additional/replacement lens plates through their dealers (although, oddly, you can’t find these on their manufacturer website). They confirmed their glass lenses are two-piece, with the lenses glued into a blue-tinted surrounding acrylic frame and designated LP-2/3/4/5 with ‘LP’ standing for Lens Plate. Their acrylic lenses are a single-piece of clear acrylic, with the lenses molded directly into and as p[art of the overall acrylic frame and designated AL-2/3/4/5 with ‘AL’ standing for Acrylic Lens. So glass lenses have a blue-tinted frame and acrylic lenses have a clear frame. Confusingly, all the ‘LP’ lens plates currently listed on Amazon indicate in their details that they are acrylic, not glass, which conflicts with the ‘LP’ designation. Counter-confusingly, the pictures show blue-tinted frames which would indicate glass lenses. So either they are glass and the ‘acrylic’ in the detail description is wrong, or they are acrylic and the LP and picture are wrong. So check what you get accordingly – maybe they’ll correct this corrected after our talk.Optical Power (Diopter) vs. Magnification Power:I did a little research to figure out what the Optical Power (‘Diopter’) vs. Magnification Power thing is all about. Turns out Optical Power (‘Diopter’) is the fundamental measurement optical professionals use because it integrates naturally with the compound optical equations typically required in their profession. Technically, the Optical Power (Diopter) of a lens equals the reciprocal of its Focal Length measured in meters. So, for example, a lens with a 20 centimeter focal length (1/5th of a meter) has a Diopter of 1 / [1/5] = 5, and a lens with a 10 cm focal length (1/10th of a meter) has a Diopter of 1 / [1/10] = 10. ‘Magnification Power’ = the increased size of the image viewed, not the Focal Length, so it is not a one-to-one linear relationship, but is generally related to Diopter as follows: Magnification = [Diopter / 4] + 1. So, for example, a 5 Diopter lens has a Magnification Power of: [5/4] + 1 = 2.25x while a 10 Diopter lens = [10/4] + 1 = 3.5x magnification. Usefully, you can add Optical Powers (Diopters) to understand the Magnification result, but not Magnification Powers. So adding a 5 Diopter OptiLoupe (2.5x) to my 5 Diopter headband (2.5x) = 10 Diopters => which converting = [10/4] + 1 = 3.5x overall magnification … similar to the maximum 10 diopter 3.5x lens plate option.Read more 166 people found this helpful Helpful Comment Report abuseRobert J. Crowley5.0 out of 5 starsBest overallJanuary 21, 2010Size: 2.5x Magnification, 8′ Focal LengthThese are everywhere and can be found at low prices if you look around, which you should because these are the most form-fitting, all-day wearable magnifiers of the bunch. Not fancy, not a lot of features, and not much weight, which is very important if you plan on actually using this type of head worn magnifier for extended periods. The lens material is very scratch resistant, easy to clean, and clear. The adjustable headband is simple and not fancy at all, but it conforms to your head, unlike the very uncomfortable B&Ls, which I also have.I bought my last pair of these for less than I see here on Amazon, where I think they are priced a little high. Even so, these are the ones to get, because the design is superior.Read more 88 people found this helpful Helpful Comment Report abuseRICKVOO4.0 out of 5 starsNot the usual Donegan quality . I was shocked. TWICE ! Finally satisfied with newest replacement.September 29, 2016Size: 2.75x Magnification, 6′ Focal LengthVerified PurchaseI have several of the Donegan OptiVISORâs in various magnifications so I know what to expect in regards to quality. I never had a problem, until now. I bought the DA-7 magnification for very close-up work and when it arrived I was shocked to find the glass lenses literally falling out of the plastic frame.So, no problem, Iâll simply snap the lenses into place and write this off as a poor assembly job by the manufacturer. After numerous attempts to get the lenses to snap into place I gave up as I was afraid of breaking the plastic frame. It appears the glass lenses are just not contoured properly and I presume the factory assembler reached the same conclusion.As is my usual approach, I first tried to contact the manufacturer via their customer service e-mail. I try to do this before writing a product review whenever possible. I got no response so here is my review. I will now take this through the very good Amazon product return/exchange channels. I had hoped to avoid that and simply get a new lens assembly from the manufacturer. Now theyâll have to replace the whole visor. I do prefer the glass lenses compared to the molded optical plastic. They are more scratch resistant IMO.UPDATE: Okay, Amazon shipped another right away before the first one was returned. I couldn’t believe my eyes. The replacement has lenses that also are not positioned well. This can’t be right! How can a product with uneven lens positioning be appropriate for precision binocular vision? If I’m wrong I wish the Donegan folks would educate me but they don’t respond.UPDATE: After writing a letter to the Donegan president I did finally get a response. They shipped me a new lens plate and asked that I return the questionable one, which I did. The newest plate is much better with the two glass lenses aligned well. So, Iâm improving my review to 4 stars because I believe the quality of Donegan products is usually good.Read more 18 people found this helpful Helpful Comment Report abusecfeied5.0 out of 5 starsOptivisor LX has plastic lens and the ‘regular’ OptiVisor has glass lensMarch 23, 2014Size: 2x Magnification, 10′ Focal LengthVerified PurchaseI own many OptiVisors and LOVE them, and so does my wife. But be careful — there are two different products under the OptiVisor name. The original OptiVisor is more expensive and has interchangeable glass lenses. The lower-priced LX model has plastic lenses. Reading through all the reviews, it appears that negative reviews are for the LX product and all the glowingly positive reviews are for the original OptiVisor product. Both are available on Amazon. My recommendation is to purchase the regular OptiVisor with the #4 lens. This is 2X magnification at a focal length of 10 inches, which is pretty much exactly what is needed for working on musical instruments, electronics, needlepoint, and most other typical uses. If you already know that you need to get your nose 4′ from your work, or you already know that you need to peer at something from 14′ away, then buy one of the other lenses, but if you just want great magnification for detailed work (especially with aging eyes) then the #4 lens is the one you want — but not the LX, the regular OptiVisor DA-4.Read more 112 people found this helpful Helpful Comment Report abuseSee all 1,075 reviewsWrite a customer review Set up an Amazon Giveaway Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. 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Donegan DA-5 OptiVisor Headband Magnifier, 2.5x Magnification, 8 Focal Length how to buy
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