Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length
Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4" Focal Length
Brand: | Donegan Optical |
---|---|
Mpn: | DA-10 |
Size: | 3.5x Magnification, 4" Focal Length |
Color: | Black |
Material Type: | Plastic |
Manufacturer: | Donegan Optical |
Model: | DA-10 |
Product Dimensions: | 10.2 x 8.0 x 2.2 inches; 9.6 ounces |
Isin: | IO8KMEIOHY0V |
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- Headband binocular visor with snap-in 3.5X magnifying lens plate for hands-free viewing
- Ground and polished glass prismatic lens for improved focus and reduced eye strain
- Visor size-adjustment knobs for customized fit
- Visor tilts out of way when not needed
- 4" focal length for a variety of uses. Genuine leather comfort band: Padded orthopedic felt adds to comfort
- Brand: Donegan Optical
- Color: Donegan Optical
- Model: DA-10
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. 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.
| |
#### Determining Magnification
|
**Diopter**
|
**Magnification**
|
**Focal length
(Distance from object)**
|
**Sample view**
---|---|---|---
20/20 vision
|
20" (50.8cm)
| ![No Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_none.gif)
2-diopter lens
|
1.50X
|
20" (50.8cm)
| ![1.50x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_1.50x.gif)
3-diopter lens
|
1.75X
|
14" (35.56cm)
| ![1.75x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_1.75x.gif)
4-diopter lens
|
2.00X
|
10" (25.4cm)
| ![2.0x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_2.0x.gif)
5-diopter lens
|
2.50X
|
8" (20.32cm)
| ![2.50x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_2.50x.gif)
7-diopter lens
|
2.75X
|
6" (15.24cm)
| ![2.75x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_2.75x.gif)
10-diopter lens
|
3.50X
|
4" (10.16cm)
| ![3.50x Magnification](https://images-na.ssl-images-
amazon.com/images/G/01/Smallparts/en_US/inca/browse/supplemental/mag_3.5x.gif)
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?**
* OptiVISOR
* Instruction manual
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Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
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