---
product_id: 1814454
title: "Donegan DA-3 OptiVISOR Headband Magnifier, 1.75X Magnification Glass Lens Plate, 14\" Focal Length"
brand: "donegan optical"
price: "R1955"
currency: ZAR
in_stock: true
reviews_count: 4
url: https://www.desertcart.co.za/products/1814454-donegan-da-3-optivisor-headband-magnifier-1-75x-magnification-glass
store_origin: ZA
region: South Africa
---

# 14" Focal Length Adjustable Fit 1.75x Magnification Donegan DA-3 OptiVISOR Headband Magnifier, 1.75X Magnification Glass Lens Plate, 14" Focal Length

**Brand:** donegan optical
**Price:** R1955
**Availability:** ✅ In Stock

## Summary

> 🔧 See the Details, Master the Craft!

## Quick Answers

- **What is this?** Donegan DA-3 OptiVISOR Headband Magnifier, 1.75X Magnification Glass Lens Plate, 14" Focal Length by donegan optical
- **How much does it cost?** R1955 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/1814454-donegan-da-3-optivisor-headband-magnifier-1-75x-magnification-glass)

## Best For

- donegan optical enthusiasts

## Why This Product

- Trusted donegan optical brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Efficiency Booster:** Transform your work experience with a tool designed to elevate your focus and precision.
- • **Customizable Comfort:** Fully adjustable headband ensures a snug fit for any user, enhancing your productivity.
- • **Versatile Focal Length:** Achieve optimal viewing with a generous 14" focal length, perfect for detailed tasks.
- • **Interchangeable Options:** Expand your capabilities with additional lens plates available for purchase.
- • **Precision Vision Enhancement:** Experience crystal-clear magnification with a 1.75x optical glass lens.

## Overview

The Donegan DA-3 OptiVISOR Headband Magnifier features a 1.75x magnification optical glass lens and a 14" focal length, designed for precision and efficiency. Its fully adjustable headband accommodates any size, while interchangeable lens plates offer customization for various tasks.

## 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 MagnificationDiopter 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?OptiVISORFitted, plastic, carrying caseInstruction manual

## Features

- Optical Glass Binocular Magnifier
- 1.75 x magnification with a focal length of 350mm (14")
- A precision instrument that improves vision and increase your efficiency
- Fully adjustable to fit any size, quickly and easily
- Interchangable lens plates are available- Sold separately (OP1763/03)

## Product Details

- **Brand:** Donegan Optical
- **Color:** Clear
- **Batteries Required?:** No
- **Item Weight:** 0.55 Pounds
- **Lens Material:** Glass

## Images

![Donegan DA-3 OptiVISOR Headband Magnifier, 1.75X Magnification Glass Lens Plate, 14" Focal Length - Image 1](https://m.media-amazon.com/images/I/71Is0pkflnL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ OptiVisor - Very impressed - After years of considering, I am glad I finally bought one!!
*by T***S on September 28, 2013*

Being one with eyes of advancing years ;-) I often find myself reaching for magnifying glasses for reading small print, and using my desk mounted magnifier lamp for working on projects with small / intricate parts. My desk magnifier is in the 2.25 - 2.5x range, and it is a high quality optic / magnifying lens with a fluorescent bulb to light up the work. It is a nice lamp, but there are times I want a little more mobility and other times where I don't like working with the lamp hanging in front of me!I am very happy I took the plunge and tried the Optivisor (I bought the 1.75x for starters). in the first few days I owned it, I used it 4 or 5 times on projects - with the most recent being when I had to find the CMOS jumper on my sons motherboard and reset it whilst the board was still in the computer. The Optivisor came in REAL handy - and having the 1.75x meant I could stay a workable distance back from the work without having to stick my face right next to it! Now, I used a flashlight and rested / pointed it at the work - so I can see some benefit on perhaps getting the LED light attachment for this. Now I have to debate spending $30 for that - which will of course make me consider building my own being the "tinkerer" that I am.Now that I have used it, I am already considering the 2.5x lens attachment as an accessory to the head band. I wish they made a 2.25x lens.In summary, here is what I like about the Optivisor:- The band fits my 7 7/8" head! I often have trouble with head-wear / hats due to my large dome ;-) and it is nice to see this fits with room to spare!- The adjustment knob on the back is easy to use, and you can snug it up comfortably without it becoming uncomfortable.- The lens / optic is quite good, the clarity is good, the focal point has a good + / - range of a couple of inches such that if you move, the work stays relatively still in focus.- The fact you can swap out different lenses on the same head piece is nice, gives you options depending on the project at hand.- The flip-up eyepiece is wonderful, you don't have to take the Optivisor off your head when you don't want magnification for a brief moment or more - and being a comfortable head band is a plus to that!What would have been nice to have:- An integrated lighting system would have been nice as a stock option - I would have paid more for that. There are after market LED lights, but they run on AA batteries, and add a big block to the side of the Optivisor to house the batteries when mounted on the band. I am worried about the extra weight on one side as a result.Overall, Highly recommended tool - I would buy it again!!Thanks for reading.UPDATE: I liked the Optivisor so much, I bought another replaceable lens at 2.5x! This is a very handy tool...

### ⭐⭐⭐⭐⭐ Works pretty well. I use this to model and paint ...
*by T***O on August 21, 2014*

Works pretty well. I use this to model and paint 28mm miniatures and once removed a small splinter.First some bad things:It does make things darker because it allows less light to your eyes. If you are working on something that requires this kind of magnification then you should already have a well lit work area. I chose this model over one that has a little flashlight on it because the flashlight would create shadows on the work.The two lenses do not create a full overlap. I see three boxes, the middle box is what both my eyes view through both lenses, each box to the side is what each individual eye sees. It's still very useful, but I wish the lenses focused better to give me a larger magnified area.This is not a bad thing but really a reminder: the focus range is important. I got the 2x magnification which has a 10" focal range. If I get the workpiece too close to me then it gets blurry. Of course, anything far away is blurry too. I'm used to working with the piece closer to my eyes so I may get a high magnification later, but for now I'm trying to give my eyes a rest and left them focus on something not so close.The good things now:First off, these are made in the USA. That's a pretty good reason to pick these over another "brand". The box it comes in is sturdy and a good storage option to avoid scratching the lenses.These fit perfectly over my glasses and it looks like they would fit over very large classes.The band adjusts easily to fit my big head and the lady's head as well. The padding on the head band makes these very comfortable. There is no annoyance when wearing these so you can focus on your task.I get headaches easily and this has not caused a headache yet. I've only worn it for about an hour at a time though and with a well-lit work area.These are great, with just 2x magnification I can really see details easily and don't strain my eyes at all.I will recommend this to others. This is the only brand I will recommend to others.

### ⭐⭐⭐⭐⭐ Enlarge Your World, Hands-Free!
*by C***J on March 26, 2025*

This headband magnifier is incredibly convenient with its adjustable fit and hands-free operation. While there are many similar options, this classic is trusted by jewelers, watchmakers, and artisans for a reason. Highly recommended for precision work!

## Frequently Bought Together

- Optivisor No.3 14" Magnifier
- Donegan Optical Optivisor Optiloupe Additional Clip on Lens

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-20*