Click for larger image and other views Image is representative of the product family.

How can we improve our images or Product Specifications?

See all products in this Product Family

Donegan DA-3 OptiVisor Headband Magnifier, 1.75x Magnification, 14" Focal Length

Be the first to review this item

ASIN B0015IS6IY

Product Specifications
Mfr Part #
DA-3
Material Type
Plastic
Pkg Qty
1
Catalog Number
FBA-DA-3C , DA-3 DOPT0004892
EAN
0633096000489
Specifications
1.75x Magnification, 14" Focal Length
Style Name
3 Diopter; DA-03
UPC
633096000489
Specification for this product family (See all  products)
Brand Name
Donegan Optical
List price:
$60.69
Price:
$36.91
You save:
$23.78 (39%)
Quantity:

In Stock (68)

This item ships for FREE with 2-Day Shipping on orders over $50. (Details)

Want it delivered on Tue, Apr 22? Order in-stock items in the next 1 day 2 hrs 2 mins and choose One-Day Shipping at checkout.

  • Share

This item has already been added to

Update Quantity Cancel

Select a List Create New List


You can add a description later

Key Features

  • Binocular headband magnifier provides hands-free magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting
  • Available in multiple dioptric strengths (indicated by the model number) that provide a specific magnification power (X), depending on the distance from the object
  • 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")
  • Optical glass lenses are ground and polished into prismatic lenses for quality and clarity
  • Can be worn over prescription or safety eyeglasses

Package Details

Shipping Weight: 0.55 pounds
Package Size: 10.2 x 8 x 2.2 inches

Product Description

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.

 

Determining Magnification

Diopter
Magnification
Focal length
(Distance from object)
Sample view
20/20 vision
20" (50.8cm)
No Magnification
2-diopter lens
1.50X
20" (50.8cm)
1.50x Magnification
3-diopter lens
1.75X
14" (35.56cm)
1.75x Magnification
4-diopter lens
2.00X
10" (25.4cm)
2.0x Magnification
5-diopter lens
2.50X
8" (20.32cm)
2.50x Magnification
7-diopter lens
2.75X
6" (15.24cm)
2.75x Magnification
10-diopter lens
3.50X
4" (10.16cm)
3.50x Magnification

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
  • Fitted, plastic, carrying case
  • Instruction manual

How can we improve our Product Description?

Customer Reviews

There are no customer reviews yet.

Be the first to review this item

Go to the HomePage

Order by Phone
M-F 8am-8pm ET, Sat-Sun 8am-5pm ET 800-220-4242

Become an Associate| Careers| About Us| Contact Us| Conditions of Use| Privacy Notice| Website Feedback | Returns

Follow Us 

© 2014 Amazon.com, Inc. and its affiliates.