Login       My Wishlist
  My Cart
$0.00 / 0 items
 
In The National Interest
Politics and Policy in the Interest of the Nation
International Access
Global Shipping Options Available
  Our Catalog   Test, Measure & Inspect   Inspection & Analysis

Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length


Extreame Savings Item! Save 43% on the Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10'' Focal Length by Donegan Optical at In The National Interest. MPN: DA-4. Hurry! Limited time offer. Offer valid only while supplies last. 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


Product Description & Reviews

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) 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. What’s in the Box? OptiVISOR Fitted, plastic, carrying case Instruction manual

Features & Highlights

  • Headband binocular visor with snap-in 2X 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
  • 10" focal length for a variety of uses

Additional Information

Manufacturer:Donegan Optical
Brand:Donegan Optical
Color:Gray
Model:DA-4
Part Number:DA-4
Publisher:Donegan Optical
Studio:Donegan Optical
MPN:DA-4
UPC:781624993960
EAN:0781624993960
Item Weight:0.4 pounds
Item Size:8.1 x 2.2 x 2.2 inches
Package Weight:0.57 pounds
Package Size:8.1 x 2.2 x 2.2 inches

Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10'' Focal Length by Donegan Optical

Buy Now:
Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length

4.5 out of 5 stars with 247 reviews
Condition: New
Lead Time: 1 - 2 Business Days
Availability: In Stock
$66.91
$38.68
You Save: 42%


Quantity:  

 


View More In Inspection & Analysis.

 


Have questions about this item, or would like to inquire about a custom or bulk order?


If you have any questions about this product, contact us by completing and submitting the form below. If you are looking for a specif part number, please include it with your message.

First Name:
Last Name:
Email Address:
Your Message:

Related Best Sellers


Wireless Otoscope, ROTEK Ear Scope 1.3MP HD Digital Ear Otoscope Inspection Camera Ear Cleaning Endoscope with 6 LED Light Compatible for iPhone Android, iPad Mac Computer PC – 6.5FT
By ROTEK
mpn: RT-106W-, ean: 0673257895325,

MagniPros 3X Hands-Free Full Page Magnifier with Flip-Out Legs & 4 Ultra Bright LED Lights & 3 Bonus Bookmark Magnifiers
By MagniPros See Things Differently
mpn: 200PSL, ean: 0700987222043,

Jiusion Aluminium Alloy Universal Adjustable Professional Base Stand Holder Desktop Support Bracket for Max 1.4" in Diameter USB Digital Microscope Endoscope Magnifier Loupe Camera (Aluminium Alloy)
By Jiusion
mpn: Jiusion-Stand,

Celestron 5 MP Handheld Digital Microscope Pro
By Celestron
mpn: 44308, ean: 0050234443081,

Jewelers Loupe 30x 60x 90x by QuickDetect | Magnifying Glasses for Close Work with LED and UV Light - Better Light Better Sight for Jewelry, Diamonds, Currency Detection, and Coins Collectors (Black)
By QuickDetect
mpn: QD-02,

Endoscope - Borescope - Endoscope Android - USB Endoscope Borescope - Micro USB - USB C Inspection Camera - Waterproof LED Automotive Vehicle Bore Drain Digital HD Semi-Rigid OTG Android Case
By Harch
mpn: USB3,5SR, ean: 0696221228349,

USB Endoscope Inspection Camera for iPhone/Android 2.0MP CMOS HD Waterproof Borescope Snake Camera -16.5FT
By CLY
mpn: OTG-N, ean: 6910089001918,

DBPOWER ( 2-in-1 ) 2Million Pixels 5Meter USB Waterproof HD 6LED Borescope Endoscope Inspection Tube Camera with USB Adpater for Android Device with OTG Function
By DBPOWER
mpn: TD0310, ean: 0689805593445,

Brightech Lightview Pro LED Lighted XL Magnifying Glass - 2 in 1 Magnifier Lamp Converts from Floor Standing to Table Light - 2.25x Magnification Bright Reading, Craft & Task Lighting - White
By Brightech
mpn: LTVPCL-W-XL, ean: 0854403007537,

Dental Surgicial Loupe Loupes 2.5x Magnification 16.5" (420mm) Working Distance Burgundy Goggles
By AmDentalStore
mpn: D-2.5RR, ean: 0013964502626,



Privacy Policy / Terms of Service / Accessibility Statement
© 2019 - inthenationalinterest.com. All Rights Reserved.