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Old 08-29-2008, 05:56 PM #49
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Default Re: Sun + Magnifying Glass = ?mw

[move]AWESOME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 08-29-2008, 06:18 PM #50
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Default Re: Sun + Magnifying Glass = ?mw

you think this is good protection http://www.homedepot.ca/webapp/wcs/s...k=P_PartNumber
look at this
http://www.instructables.com/id/Gian...Opti/?ALLSTEPS
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Old 08-31-2008, 09:35 PM #51
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Default Re: Sun + Magnifying Glass = ?mw

the brazing gogglew will help, but you will want about a shade 9.
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Old 09-01-2008, 05:46 PM #52
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Default Re: Sun + Magnifying Glass = ?mw

Well that definitely was interesting...

I finally dug out my old screen and took the fresnel out of it, then rigged the fresnel only back into the frame. I took it out in the sun, and after finding just the right angle/focal point(not an easy task while freehandedly holding it), I managed to instantly ignite cardboard ;D. The best focal point I could get was about 25x25mm.

I tried a 2x4.. it only took about 5-6 seconds before I had a flameI couldn't manage to hold it steady for long though..

I hope to rig a nice solid frame/ mount to it, and see what kind of practical uses I can find for this setup

EDIT: For safety, anyone trying this will definitely need good eye protection... All I have is a couple pair of sunglasses doubled up, and I was still seeing spots for a couple minutes
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Old 09-01-2008, 07:20 PM #53
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Default Re: Sun + Magnifying Glass = ?mw

get welding goggles
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Old 09-02-2008, 11:51 AM #54
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Default Re: Sun + Magnifying Glass = ?mw

This giant-fresnel fire starting stuff almost requires a video. I'm going to have to find somewhere to get one of these huge lenses. Jamil, did you just walk into a tv repair shop and ask for one, and they gave one to you? Thats pretty awesome! You should probably try to make some kind of frame to mount it in, then you could attach it to some kind of handle and walk around roasting entire anthills in one pass. 8-)
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Old 09-02-2008, 12:52 PM #55
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Default Re: Sun + Magnifying Glass = ?mw

It is kind of tricky to get a huge lens like that in just the right position.. so frying anthills will require some finesse. Also the frame is definitely required, as the fresnel is flimsy, and needs to be flat to work correctly.

I'll try to post a video, if I can fin a suitable filter for my camera.. the spot these create is BRIGHT .
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Old 09-02-2008, 08:26 PM #56
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Default Re: Sun + Magnifying Glass = ?mw

Quote:
Originally Posted by jdub
This giant-fresnel fire starting stuff almost requires a video. I'm going to have to find somewhere to get one of these huge lenses. Jamil, did you just walk into a tv repair shop and ask for one, and they gave one to you? Thats pretty awesome! You should probably try to make some kind of frame to mount it in, then you could attach it to some kind of handle and walk around roasting entire anthills in one pass. 8-)
i called first and will make a frame
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Old 09-05-2008, 12:49 AM #57
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Default Re: Sun + Magnifying Glass = ?mw

dude i cant believe you got that for free, wth!!

in argentina not even the air is free :P



oh, and how do you do that scrolling text (html cmd?)
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Old 09-05-2008, 01:42 AM #58
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Default Re: Sun + Magnifying Glass = ?mw

Quote:
Originally Posted by Niko
dude i cant believe you got that for free, wth!!

in argentina not even the air is free :P



oh, and how do you do that scrolling text (html cmd?)
yeah i never get anything for free except this and a laser from dave.
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Old 09-12-2008, 11:04 PM #59
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Default Re: Sun + Magnifying Glass = ?mw

i got a reply."Dear Jamil

Thank you for your inquiry.
The 1040mm x 780mm size lens,the price is FOB Nanjing USD100/pc.
Please inform us your order quantity of the 1040x780 lens and your address include your telephone number. I could calculate the total price include the express charge for you.

Best Regards
Ms Sun"
i wonder why her name is ms sun
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Old 09-13-2008, 09:51 AM #60
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Default Re: Sun + Magnifying Glass = ?mw

I want to try and get a fresnel lens now after reading this thread. I went to order that 13" fresnel lens from edmund optics, they are only $8, spent like $10 on some other things, but shipping to australia worked out well over $80!
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Old 09-15-2008, 06:44 PM #61
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Default Re: Sun + Magnifying Glass = ?mw

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i wonder why her name is ms sun
She's chinese
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Old 09-15-2008, 08:04 PM #62
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Default Re: Sun + Magnifying Glass = ?mw

mr sun we use it to burn with sun
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Old 09-18-2008, 12:13 AM #63
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Default Re: Sun + Magnifying Glass = ?mw

They have what seem to be good Fresnel Lenses on ebay for 6$ shipped.

Here is the link.

http://cgi.ebay.com/FRESNEL-LENS-SOL...QQcmdZViewItem
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Old 09-21-2008, 12:31 AM #64
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Default Re: Sun + Magnifying Glass = ?mw

I was in the dollar store and there they were ! Fresnel lenses 8.5 x 11 inches for 1$ each.
I got a fresnel 29 x 38 inches from a projection TV in the garbage at work. These lenses are worth the effort to look around for. (And I thought that my 4 inch lens was a good burner) In the photo, the dollar store fresnel in in its package, with a 40 inch metal ruler beside it, are leaning on the big fresnel from the garbage. Total cost for both - $1 .
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