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Old 08-22-2008, 02:40 AM #33
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Default Re: Sun + Magnifying Glass = ?mw

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


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Old 08-22-2008, 06:37 AM #34
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Default Re: Sun + Magnifying Glass = ?mw

by rear projection tvs do u mean cathode ray tube?
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Old 08-22-2008, 03:02 PM #35
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Default Re: Sun + Magnifying Glass = ?mw

no they aren't crt tv's they are called projection tv.
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Old 08-23-2008, 12:08 AM #36
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Default Re: Sun + Magnifying Glass = ?mw

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"
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Old 08-23-2008, 03:37 AM #37
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Default Re: Sun + Magnifying Glass = ?mw

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

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Old 08-23-2008, 02:24 PM #38
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Default Re: Sun + Magnifying Glass = ?mw

how does a projection tv look like.
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Old 08-23-2008, 06:22 PM #39
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Default Re: Sun + Magnifying Glass = ?mw

like this



or this
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Old 08-24-2008, 02:40 AM #40
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Default Re: Sun + Magnifying Glass = ?mw

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how does a projection tv look like.
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Old 08-24-2008, 06:04 AM #41
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Default Re: Sun + Magnifying Glass = ?mw

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....
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Old 08-28-2008, 02:15 AM #42
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Default Re: Sun + Magnifying Glass = ?mw

look http://fresneloptic.com/html_en/solar_big_lens.htm
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Old 08-28-2008, 05:27 AM #43
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Default Re: Sun + Magnifying Glass = ?mw

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;D Cool! What is the price for the one in the picture?
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Old 08-28-2008, 01:25 PM #44
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Default Re: Sun + Magnifying Glass = ?mw

i asked no reply.
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Old 08-29-2008, 04:56 PM #45
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Default Re: Sun + Magnifying Glass = ?mw

i went to a tv repair shop and got a free one.its 32inch by 45 inch.
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Old 08-29-2008, 05:07 PM #46
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Default Re: Sun + Magnifying Glass = ?mw

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i went to a tv repair shop and got a free one.its 32inch by 45 inch.
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Old 08-29-2008, 05:36 PM #47
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Default Re: Sun + Magnifying Glass = ?mw

here you can see the ruler is which is 16 inch.
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Old 08-29-2008, 05:37 PM #48
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Default Re: Sun + Magnifying Glass = ?mw

sorry don't know how to resize.
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