8.3 x 11.75 LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS by Cz Garden Supply

8.3 x 11.75 LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS by Cz Garden Supply

Q: What is the focal length? Thank you.

The groove pitch is 0.5mm. The focal length is 320mm

Q: Cant I cut this into a smaller sizes with an exacto knife or box cutter?

Wow, a bunch of wrong answers. Not only is it possible to trim the edges and use the center portion, it is even possible to cut it into sections, and each section will continue to function. The only difference is that a lens cut from a location not in the center will need to be held over to one side. If it isn't apparent what the total effect will be, just imagine that you took the lens and covered half of it with paper and tape, and then covered have of the remaining rectangular piece, so that once again you have a square section. Obviously this section has to be held to one side, and it probably wouldn't work very well for a reading lens. But you certainly could still use it to start a fire.

Q: what is the magnification

Unlike with a telescope or a microscope, a magnifying lens's magnification varies as you move closer to or farther from the object you are observing. I can tell you that it can project the light from the sun to a point about 1/2" in diameter. This is a concentration, compared to the size of the rectangular lens, of almost a factor of 500. That doesn't mean that you can see somethings 500 times its size by looking through the lens. What is means is that it has a huge amount of light gathering surface and focuses it on a very small spot. This may not be the answer you are looking for; but I can't think of a better way of stating it. It can ignite a fire in a second or so.

Q: How can it be used for 'do it yourself solar cooking'?would this size be bigenough to cook?wouln't it need reflector to reflect to the bottom of pan?

I have seen a fresnel lens used to cook (at burning man). They pointed the beam at a cast iron and cast iron pans are good at dispersing the heat evenly across the pan. It probably took a while for it to heat up but it was definitely working.

4.2/5

Product ID: 98741491

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Details

Brand
Cz Garden
Colour
clear
Batteries Required?
No
Item Weight
50 g
Lens Material
Glass

📏8.3 x 11.75 inch full-page size

🔍3x magnification power

♻️glass lens, eco-friendly & durable

Frequently Bought Together

8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS (1 pack PREMIUM GRADE Large Lens)

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Fresnel Lens Large, 300x300mm, Focal Length 300mm, Acrylic Lens (not Glass),Olar Death ray for Physics Classroom,Magnifiying Sheet Fire Starter for Solar Heating, Solar Oven.

Description

🔎 Amplify your vision, amplify your impact!

FULL PAGE COVERAGE - Generous 8.3 x 11.75 inch size lets you magnify entire pages or large surfaces effortlessly.
ECO CONSCIOUS DURABLE - Crafted from premium glass, this lens is built to last without batteries or plastic waste.
VERSATILE DIY ESSENTIAL - Perfect for solar ovens, projection TVs, and garden diagnostics—unlock creative projects with ease.
SEE EVERY DETAIL CLEARLY - Experience 3x magnification that brings even the tiniest text and images into sharp focus.
GARDEN GREENHOUSE HELPER - Spot pests and plant deficiencies early to keep your green space thriving and Instagram-worthy.

The Cz Garden Supply Large 3X Fresnel Lens is a durable, full-page magnifier measuring 8.3 x 11.75 inches, crafted from glass for eco-friendly use. Ideal for reading fine print, DIY solar cooking, projection TV projects, and garden care, it empowers professionals and hobbyists alike to see more and do more without batteries or fuss.

Specifications

Brand	Cz Garden Supply
Colour	clear
Batteries Required?	No
Item Weight	50 g
Lens Material	Glass
Magnification Strength	3 x
UPC	805731900243 805731900991
Global Trade Identification Number	00805731900243
Model Number	CzFLA4-1
Shape	rectangular
Manufacturer Part Number	CzFLA4-1

Have a Question? See What Others Asked

What is the focal length? Thank you.

Cant I cut this into a smaller sizes with an exacto knife or box cutter?

what is the magnification

How can it be used for 'do it yourself solar cooking'?would this size be bigenough to cook?wouln't it need reflector to reflect to the bottom of pan?

Reviews

4.2

All from verified purchases

S**

good product

12.04.2025

A**.

Good one.

Considering the past negative reviews, I was a little hesitant to buy this product but definitely the seller has corrected and delivered a fresh product and also good packing.

23.03.2023

J**J

Good for kids science experiment projects

Able to focus easily. Useful for fun sciencr learning activities for kids like buring paper pieces or melting wax

10.11.2024

S**S

I use it for laptop to read.

I have to do extensive reading of research studies that messed with my eyes despite the highest quality glasses I wore. Finally bought this to read and stuck it by maintaining some distance from screen. Hope this helps someone

13.03.2025

J**I

REALLY USEFUL

FRESNEL LENS, THAT IS THE TECHNICAL NAME OF THIS PRODUCT.YOU HAVE TO HAVE IT IN YOUR HANDS AND SEE THROUGH IT TO GET THE WONDERFUL FEEL OF THIS PRODUCT.THANKS TO THE SELLER FOR BRINGING TO US SUCH A SPECIAL ITEM.AND A TON OF THANKS TO AMAZON COURIER SERVICES, FOR GETTING SUCH A FRAGILE PRODUCT IN A VERY GOOD CONDITION.🙏🇮🇳🙏

14.01.2022

D**J

It is a plastic sheet fresnel lens

Came with scratches . Does the magnification. But it is basically plastic sheet and not glass lens. So i don't think it is good for solar cooker. Can damage the lens due to heat.

6.12.2022

H**X

Not that useful. The letters go blur when you lift the sheet a little high.

The media could not be loaded.

5.11.2023

P**S

Misleading description. Plastic instead of glass

Description says it's made of glass. Received plastic sheet.

16.04.2025

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