Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length
Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length
Donegan DA-4 OptiVISOR Headband Magnifier, 2X Magnification Glass Lens Plate, 10" Focal Length
| Brand: | Donegan Optical |
|---|---|
| Mpn: | DA-4 |
| Size: | 2x Magnification, 10" Focal Length |
| Color: | Gray |
| Material Type: | Plastic |
| Manufacturer: | Donegan Optical |
| Model: | DA-4 |
| Product Dimensions: | 10.5 x 8.1 x 2.2 inches; 6.4 ounces |
| Isin: | IDTZGZBYOW0D |
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- 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
- Brand: Donegan Optical
- Color: Donegan Optical
- Model: DA-4
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
Processing Time
- We process and ship orders Monday through Friday, excluding holidays.
- Most orders are processed within 1–3 business days, depending on product availability.
- Processing time does not include delivery time, which varies based on your location and the product’s shipping origin.
Shipping Coverage
We currently ship to addresses within the United States only.
Products may ship from:
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Each product page clearly displays the “Ships From” location before checkout.
Shipping Methods & Estimated Delivery
| Shipping Method | Estimated Delivery | Cost |
|---|---|---|
| Free Shipping (US) | 5–10 business days | Free, available on eligible items |
| Standard Shipping (US to US by Item) | 5–10 business days | $6.50 for the first item, $3.00 each additional |
| Standard Shipping (From US Warehouse by Weight) | 3–7 business days | Starts at $6.50, increasing by $2 for every additional 4 oz (0.25 lb) up to 1 lb, then by $4 for each additional pound beyond 1 lb. |
| Extended Delivery (Ships from Overseas Warehouse) | 10–15 business days | $14.50 for the first item, $4.00 each additional |
Shipping costs vary by product weight, quantity and origin. Exact rates and delivery estimates are displayed on each product page and confirmed during checkout.
Free Shipping
We offer free standard shipping on select products or during promotional periods. Availability of free shipping will be displayed on the product page and at checkout.
Carriers
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Order Cancellation Policy
Customers may request to cancel an order before it has been shipped.
Once the package has been shipped, cancellations are no longer possible; however, you may still request a return after receiving your order.
How to Request a Cancellation
You can contact us through:
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Email: support@ibspot.com
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Contact Form: Submit a request through our Contact Us page
Please submit your cancellation request as soon as possible after placing the order to allow us to process it before shipment.
Return Policy
We accept returns for most items within 30 days of delivery for a full refund.
To be eligible for a return:
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The item must be unused, in the same condition as received, and in its original packaging.
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A tracking number must be provided to confirm the return shipment.
Non-Returnable Items
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Perishable goods (for example, food, flowers, newspapers, magazines)
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Hazardous materials or flammable liquids/gases
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Some health and personal care items
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Books with obvious signs of use
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Opened CDs, DVDs, software, or vinyl records
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Items returned more than 30 days after delivery
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Shipping Cost for Returns
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We will provide a free return shipping label.
If a return is sent back without prior contact or without our provided label, we cannot be held responsible for return shipping costs.
For items valued over $75, we recommend using a trackable shipping service or purchasing shipping insurance.
We cannot guarantee that we will receive your returned item if shipped independently.
Refund Processing
Once your return is received and inspected:
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In-store returns are refunded to the original form of payment or issued as a gift card.
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Mail-in returns using our prepaid label are refunded to the original payment method within 3–5 business days after we receive your return.
Please allow:
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5–7 business days for the return to reach our Returns Center.
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An additional 3–10 business days for your bank to post the refund to your account.
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Exchanges
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The fastest way to get what you need is to return the original item and place a new order once your return is accepted.
Return Address
IBSPOT Return Center
15 Sawmill Ln
Dover Plains, NY 12522
United States
Customer Support
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Email: support@ibspot.com
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