What is this used for and how should you use it?

it can be used for solar cooking. There are many videos - just take care - the focal point will become very hot.

Can I use this as a solar blowtorch?

Yes you can. How ever the bigger the surface area the hotter the fresnel lens will be. It also takes very very steady hands so making a frame for it at the optimum hight which will take some experimentation is the best way to make a solar torch. Just make sure the frame in which the lens sits can swivel around and you’ll get there. The glass lenses are the best though if you can find them as those never get cloudy like plastic lenses do over time and there more optically clear but the lenses out of old projector TVs are the best as those are huge if you can find them but they are plastic though but you can very easily melt steel, rock or any material with those things. Hope this helps you. Regards Stu.

What is the magnification? Can it be used for reading?

I don't think it would be suitable for reading. It has to be held away from the object and is quite large and heavy. Magnification is x 3.

Large Rigid Solar Fresnel Lens 395mm X 395mm

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VT23709

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Ignite brilliance with every ray – the ultimate solar magnifier for pros! 🔆

DURABLE PORTABLE - Lightweight 450g acrylic design combines ruggedness with easy handling, ideal for professionals and hobbyists alike.
VERSATILE SOLAR TOOL - Perfect for light gathering, projection, magnification, or even fire-starting—ignite your next adventure or experiment.
MAXIMIZE LIGHT CAPTURE - Harness intense sunlight with a massive 395mm x 395mm acrylic Fresnel lens for unparalleled brightness.
PRECISION FOCUSED POWER - 220mm focal length engineered to concentrate light with laser-like accuracy for extreme heat generation.
TRIPLE MAGNIFICATION IMPACT - 3x magnification delivers crystal-clear clarity, outperforming standard magnifiers for science or survival.

The Large Rigid Solar Fresnel Lens (395mm x 395mm) by DarwinUK is a high-clarity acrylic lens featuring a 0.5mm groove pitch, 220mm focal length, and 3x magnification. Designed for intense light concentration, it can generate extreme heat (up to 1980°C), making it perfect for scientific experiments, outdoor survival, or precision light gathering. Lightweight and durable, this lens is a must-have for professionals seeking powerful optical performance.

Specifications

ASIN	B01MU4HR20
Best Sellers Rank	48,198 in Garden ( See Top 100 in Garden ) 165 in Continuous Output Lighting 411 in Magnifying Glasses 3,926 in Garden Furniture & Accessories
Brand	DarwinUK
Colour	Transparent
Customer Reviews	4.2 4.2 out of 5 stars (36)
Item Dimensions L x W	39.5L x 39.5W centimetres
Item Weight	450 Grams
Manufacturer	DarwinUK
Material	Acrylic
Operation Mode	Manual
Part Number	ViiAN
Style	Laser
UPC	635131149269
Unit Count	1.0 count

Reviews

S**U

Really fantastic quality from a reputable supplier.

Fantastic clarity, really clear to get maximum light transmittance and what would just top this and make this the best on Amazon would be a little kit to go with it or bought separately where you would make a frame like a picture frame only with no backing. I actually purchased this for a science experiment with my nephew where we could measure its temperature at its optimum focal length and it's brightness. I mean this thing put a magnifying glass to shame. We had the temperature up to 1980 C. Hot enough to melt brass. We actually melted a brass pad lock off my nephews bike as he had lossed the key to it. WORD OF WARNING: WERE EYE PROTECTION LIKE WELDING HELMET AS THE BRIGHTNESS IS SUPER INTENSE !!!

27.04.2017

Y**E

Amazing power

I didn't realise how powerful this thing is until I left outside and cooked my mother's left leg sunbathing cheers

18.05.2024

J**E

Great

Great delivery just what I wanted

29.05.2019

S**H

Great product.

Great product. Just what I wanted.

12.10.2018

M**X

Excellent !

1.09.2017

A**O

llego rapido y sin ningun daño en la lente, me imagine que vendria con el marco para sujetar la lente como en la foto pero no es asi, viene solo la lente.

24.01.2017

F**K

Die Fresnellinse besteht aus einem spröden Kunststoff, der bei der ersten Lieferung leider zerbrochen bei mir ankam. Der Händler aus GB hat aber sofort und superfreundlich für eine Ersatzlieferung gesorgt. Ich habe die Fresnellinse nun in einen Bilderrahmen eingebaut um zukünftig ein versehentliches Durchbrechen zu verhindern. Bin sehr zufrieden mit der optischen Qualität.

9.07.2020

M**O

E' la prima che acquisto e devo dire che e semplicemente favolosa

11.02.2020

R**V

j'ai acheté cet article pour faire démarrer un petit feu de barbecue, et pour quelques branches mortes dans mon jardin ça marche super bien (veillez quand même au règlementations préfectorales pour les périodes d'autorisations à faire du feu dans votre jardin), il suffit de concentrer un point de lumière sur du papier ou du bois et en plein soleil , sans nuages, une flamme apparait instantanément. donc attention ça brule. état neuf de très bonne qualité,.. j'en suis super content. livraison rapide.

7.03.2017

T**L

Cette lentille de Fresnel correspond à ce que j'attendais. Délai et livraison ok! A voir sur la durée la qualité du matériau utilisé.

16.04.2018

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