|Item Weight||1 ounces|
|Product Dimensions||10.2 x 0.1 x 7 inches|
|Manufacturer Part Number||B001TLJXJ8|
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1 X 3X Full Page Magnifier Fresnel Lens
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- Full Page Magnifying Sheet – 7" x 10.25”
- 3X Magnification
- Low Optical Distortion
- Flexible Optical PVC Makes Them Light-Weight and Nearly Shatterproof
- Comes in a reusable protective plastic sleeve.
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Full Page Fresnel Lens Magnifying Sheets. These are good quality magnifying sheets. They are great for reading newspapers, books and menus. Each 3X magnification sheet measures 7 x 10.25 inches with no boarder. They are made from Flexible high quality optical PVC. This allows them to be thinner with less distortion then thicker 3X magnification sheets and also makes them very lightweight and easy to hold. Optical PVC is also virtually shatterproof. Despite being flexible, they can still be held level over a surface with just 3 fingers on one corner or a side as pictured. Each sheet is protected in a reusable protective plastic sleeve. Lens Specifications: 7.00" x 10.25" (Inches). Thickness: 0.4mm. Weight: 26 grams. Material: optical PVC. Groove pitch: 0.3mm. Focal length: 300mm. Magnification: 3X.
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For those who may not understand how the Fresnel lens works, there is no magnification if the lens is directly against the object or sheet you are trying to magnify. As you pull away holding the lens, what you view will gradually magnify. As far as I can tell, the maximum 3X magnification for this particular lens is approximately six inches from what you are viewing.
This magnifier is not as flimsy and unwieldy as some suggest. It is possible to comfortably hold the lens in landscape (horizontally) with one hand at the bottom corner as the product image suggests, but you will find it more effective and easier to manage if you use two hands in landscape. Holding it in portrait (vertically) with one or two hands is not as comfortable, personally.
The best explanation videos on Fresnel lens (to show your kids who are old enough to understand the video) are by VegaScienceTrust on u tube. I'm not affiliated with them in any way.
Had I wanted it to magnify text for reading (as advertised) I would have rated 2 stars. The lens arrived damaged because seller doesn't package in manner protecting lens from mere pen-pressure applied to mailing envelope. When they filled in shipping address on mailing envelope, their pen pressured through and wrote permanently (damaged) into the Fresnel ridges on the lens. I cannot imagine why Seller would PUT LENS INTO ENVELOPE BEFORE WRITING ON ENVELOPE! The result is that anything written upon envelope gets permanently marked (scratched) into the Fresnel ridges, and you'll see that every time you look through the lens. It cannot be removed.
This product is too flimsy for unsupported use. The best fix is use scotch tape to mount it onto 8 X 10 inch cheap photo frame, obviously first removing all parts (glass, backing board, etc) from center of photo frame.
prevent children from having any access to this lens unless you are with them and you are holding the lens at all times. In sunlight, this lens is at least as dangerous as a cigarette lighter, for a child. It can focus sunlight to bring most anything to flame within seconds. Caution it is easy to forget that reflective surfaces can easily redirect the Fresnel-focused sunlight and permanently damage eyes in a split second. Have everyone wear dark sunglasses, and never focus sunlight upon a highly reflective surface.
Anticipating your question, we did NOT have any accidents when using this product. We have common sense and followed above rules.
My only concern is, it is plastic, so it can be chipped or cracked if dropped or unduly flexed. Accordingly, it's not a toy and must be handled with a modicum of care.
Most recent customer reviews
the chipped corner has sharp plastic edges and can cut you if you're not careful.