2-in-1 Spring-Arm Magnifier Desk Lamp - Large 7-1/2" X 6-1/4" Lens - 5 Diopter

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Price: $127.99    

Product Feature

• Professional quality UL listed lamp provides efficient daylight-spectrum fluorescent light
• Large 7-1/2 x 6-1/4" optical-quality precision ground lens shows fine detail with excellent clarity
• 5-diopter magnification enlarges print, text and work pieces to 225% actual size; lens dust cover
• Automatic memory arm adjusts position with finger touch and then holds it; 3-way swivel lamp head
• Anti-tip base without clamps or attachment; UL-listed lamp with convenient lamp-head power switch

Product Description

As we age, our eyes naturally lose some of their ability to focus close-in. A teenager can focus on objects as close as 3" but by age 50 that distance can increase to 18" - VERY frustrating when it limits your work or hobby. This premium-grade lamp is a simple and effective solution for seeing almost anything bigger, better and brighter. Twin 9-watt U-type fluorescent bulbs provide excellent task lighting with less heat (<100 degrees vs. 350+ for incandescent bulbs) and reduced shadows glare - while using less energy! 34" arm has unique balanced cantilever mechanism that allows position adjustment with just light touch then holds it. weighted platform keeps lamp from tipping when extended. lamp-head swivels, tilts rotates adjustable tension. 5-diopter lens (2.25x) focal range of 7-9". removable flip-up dust cover protects helps keep clean. 8" x 12", 20 lbs. steel tube durable classic white enamel finish. also available in 3-diopter, clamp-on style wheeled floor lamp. on>

2-in-1 Spring-Arm Magnifier Desk Lamp - Large 7-1/2" X 6-1/4" Lens - 5 Diopter Review

This is a great magnifying lamp with very little distortion! The focal range is long and wide due to the shape of the lens. I work on a bead loom with tiny beads and this lamp really helps with eye fatigue. I would highly recommend this lamp for anyone working with detailed items. The lamp head itself is just over 11" wide by 8 1/2" deep, so if your space is limited, this may not be the lamp for you. When not using the magnifier, this makes a great reading or work lamp. This lamp does not fold up flat and tall because the head is too big, but that is not a problem for me. This is a professional quality heavy duty magnifying lamp and I am very pleased with my purchase! Oh, I thought I might explain the word "Diopter" -

Diopter refers to the curvature of a lens. As the diopter increases, the lens becomes thicker and the curvature greater.
As the curvature increases, light rays are redirected to fill a greater portion of the viewer's retina, which makes the object look bigger.

So, the higher the diopter number, the closer you must hold the object to the magnifier because the lens is curved more and the further away from the lens, the more distortion you will get. The lower the diopter number, the lens is less curved and you can hold the object further away from the lens without distortion.

Diopter 3 - would be great for reading a book or a letter or fine print etc.,
Diopter 5 - you will have to hold that same print closer to the lens so that it does not become distorted, and
Diopter 8 - you have a very small window of view without distortion, used mainly for very fine detail held up to the magnifier.
I wanted this magnifier to be about 11" away from my hands and the 5 Diopter with the wide lens appears to be just right for that purpose.

Focal length is the distance from the center of a lens to the point where the light rays converge and the object is in optimal focus (focal point).
This is also known as the "working distance" of the lens.
Focal length is important when the task requires using tools with the object being viewed.
Because focal length decreases as power increases, there is less room to perform work on an object under higher power lenses.

The field of view is the size of the magnified area under the lens that is in focus.
The field of view decreases as power increases.
More powerful lenses make small details look big, but less of the total object is visible.
There is a trade-off for the viewer who must decide between the size of the field of view and amount of magnification.

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