Sun + Magnifying Glass = ?mw

[jamilm9]

wheres the cheapest place for a lens that ships to canada that is at least 40"by 40"

 

[cybob101]

by rear projection tvs do u mean cathode ray tube?

 

[jamilm9]

no they aren't crt tv's they are called projection tv.

 

[laserlover]

i built a fresnel lens magnifying glass today, i cut out a 7 inch diameter circle and i taped a handle to a metal ring and then i glued the lens to the ring and viola, i had a burner that can ignite matches in less than 2 seconds, oh and by the way, that is the opposite end of course! i will post some picture of it in the multimedia section later! the thread will be called "big burner"

 

[flogged]

There's a lot of energy in sunlight. Around 1000 watts per square meter on a bright day.

Years ago Edmund scientific sold a a giant fresnel lens, over a couple feet square. It was sold as 'melting asphalt in seconds'. Unfortunately my parents banned the idea.

I did find this one, 11" square. That's still about 78 watts of power (78,000 mW).
http://scientificsonline.com/product.asp_Q_pn_E_3052833

 

[jamilm9]

how does a projection tv look like.

 

[laserlover]

like this

or this

 

[laserlover]

how does a projection tv look like.

Google is your friend! use him

 

[Glaserfan]

I'll have to dig out my old 42" RPTV fresnel and see what I can make it do ;D

I'll get some videos if I can find a suitable filter for in front of my digital camera..I don't want to mess up the sensor in it LOL. I probably will wear 2 pair of sunglasses to help protect my eyes in the process....

 

[jamilm9]

look http://fresneloptic.com/html_en/solar_big_lens.htm

 

[artix]

look http://fresneloptic.com/html_en/solar_big_lens.htm

;D Cool! What is the price for the one in the picture?

 

[jamilm9]

i asked no reply.

 

[jamilm9]

i went to a tv repair shop and got a free one.its 32inch by 45 inch.

 

[artix]

i went to a tv repair shop and got a free one.its 32inch by 45 inch.

Post your pictures [highlight][move]NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!![/move][/highlight]

 

[jamilm9]

here you can see the ruler is which is 16 inch.

 

[jamilm9]

sorry don't know how to resize.