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Donegan DA-2 OptiVISOR Headband Magnifier, 1.5X Magnification Glass Lens Plate, 20" Focal Length
|Price:||$46.03 & FREE Shipping on orders over $49. Details|
|You Save:||$20.88 (31%)|
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- 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
|Number of Items||1|
|Is Assembly Required||N|
|Size||1.5x Magnification, 20" Focal Length|
|Specification Met||certified frustration-free|
|Style Name||2 Diopter; DA-2|
Specification for this product family
|Brand Name||Donegan Optical|
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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 8”). 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.
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?
- Fitted, plastic, carrying case
- Instruction manual
Size: 1.5x Magnification, 20" Focal Length
Top Customer Reviews
Others have reviewed the limited depth of field. This is true--you'll need to be close to the subject for it to be in focus. Please understand that this is not a fault of the manufacturer but is the way optics perform when designed to work in this fashion. In my opinion, this limitation makes these an unsuitable solution for reading unless you need extreme help and are willing to hold the material very close. I've tried. It's clumsy.
Two notes from my years of using this product. 1) There are "thumbturn" tighteners (small knobs visible in the picture) that keep the visor in position once you've adjusted it on your head. We tend to only tighten the one on the right because we are right handed. The left one became loose, fell off, and was lost for quite some time before we located it under the couch. Keep both of these finger-tight or you may lose one of them. 2) The optics can scratch if you store the visor improperly. We like the visor so much that we put a hook on the wall near the office desk--just an arm's reach away. Easy access. Safe storage.
These are ruggedly built, well-designed and have helped me to solve many problems. Therefore, they get my 5-star approval and recommendation.
but is light weight and I can wear them all day working on electronic circuit boards.
There are many magifications of this product but this one a #5 is just right gives you about 7-8 inches away from work area
The GLASS lens sold me on this particular one over the others I looked at. From other reviewer's comments of all the brands I researched, I gathered that the optical quality for the glass lens was superior to the more common, plastic lens which often was or became blurry or distorted and could not be worn for extended periods without developing a headache or eye-distress.
I was also concerned about lens scratches, etc. I believe I made the correct choice. The headband is infinitely adjustable and lined in the forehead area with a soft headpiece which makes it very comfortable to wear for extended periods of time. The visor has knobs on each side allowing me to adjust tension for the task at hand. After the initial period of getting used to wearing the headband and adjusting my working distances, I have worn this magnifier for hours without getting a headache or developing eye-distress! The OptiVisor also fits comfortably with my prescription glasses on.
I also like the fact that the lens can be changed out for another magnification or replaced should it become damaged, without having to replace the entire headband. Although made entirely from plastic (except for the lens) the Donegan OptiVisor quality is excellent, and given some care in use and storage, should last for several years. I do not regret purchasing this product -- and after shopping around, Amazon was the least expensive online store I found.
This magnifier is good overall. The fit is nice and snug and pretty comfortable to wear for extended time. The lenses are good quality, although if I had to buy another I'd get a lower magnification than this 3-1/2X. It's very hard to work with items because the focal length is under 4 inches. The 2.5X or 2.75X are probably better for getting more working distance. The knob-adjust headband is a nice feature for quickly adjusting to a snug fit, and the side knobs let you adjust the up/down swing very easily.
I also ordered the OptiLoupe 2.5X addon, but that thing is pretty useless. It's very hard to use and it has a narrow zone of vision.
Overall, the construction and quality of this headband visor is very good and it does what it claims.
It costs a bit more than most others, but it seems to be of very good construction.
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.
Most Recent Customer Reviews
It worked great for about 3 months. But then began to fall apart by use.
The interchangeable magnifiers are difficult to change, and keep flush. Read more
Seems to be a little clearer than the plastic lense version I previously used (different brand). Really like the option to be able to switch out lense plates. Read morePublished 5 days ago by ND
Can wear for hours and see small things perfectly. Light weight. Great optical qualityPublished 10 days ago by TechHead
Top quality from Optivisor, as always. Got this at a great price and prime got it to me the next day.Published 26 days ago by Steven Hindson
OptiVisor Optical Glass Binocular Magnifier...seems quite good, easy to use and about the right magnification for my wife's bead work and my electronics work.
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