Condenser ?

boris333 · 6th June 2004, 11:31 PM

i have found a condenser that is 24X36 ? .. what is a condenser can i use this as fresnel lens ?

boris333 · 6th June 2004, 11:58 PM

are those paper magnifiers same as fresnel lenses ?

machs_fuel · 7th June 2004, 06:22 AM

yup. although i suppose that they would melt rather easily

rcabezas · 7th June 2004, 04:01 PM

They DO melt rather easily, I can attest to that..

boris333 · 9th June 2004, 01:01 AM

i just got one of these http://www.buyonlinenow.com/viewprod...17C&source=ink

i think it will work as fresnel what do u guys think ?

boris333 · 9th June 2004, 05:35 PM

so what u guys think ?

rcabezas · 9th June 2004, 05:53 PM

I honestly do not know what to say. If what you got is in fact a fresnel, then you overpayed incredibly. $130 for a fresnel?? If you read around these forums, you will find out that you can get fresnels a lot cheaper than that.
Heck, you can even get a complete OHP on ebay for $25 and get the fresnel off of it. You can also find them on the web for $20-$40, and also several members here sell them..
Now, maybe the fresnel you got is ultra-high quality or something that would justify that price, I don't know. What's the focal length on it, anyway?
Raf

boris333 · 9th June 2004, 09:04 PM

i didn't pay $130 . i got it of ebay for $ 70 CND shipped .. i don't know what the focal length is ? the size is 10.5X13.5 ... can't wait on diylabs ... also u can get those tv magnifiers .. big fresnel .. but i don't know if this is gonna work i ll let u all know when i get it ..

rcabezas · 10th June 2004, 05:07 AM

don't get the big tv fresnels, they are just page magnifiers (low quality fresnels). to find out the focal length you could focus the sun through the lens on the ground and measure how high you have it.

boris333 · 10th June 2004, 11:44 AM

i didn't get a tv magnifier i m just saying that they are big .. i ll measure the focal length if it works ..

6th June 2004, 11:31 PM	#1
boris333 diyAudio Member Join Date: Apr 2004 Location: .	Condenser ? i have found a condenser that is 24X36 ? .. what is a condenser can i use this as fresnel lens ?

7th June 2004, 06:22 AM	#3
machs_fuel diyAudio Member Join Date: Mar 2003 Location: Fredericton, New Brunswick	yup. although i suppose that they would melt rather easily __________________ She's built like a steak house but she handles like a bistro. Raygun Project Pages - http://machs-fuel.tk

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6th June 2004, 11:58 PM	#2
boris333 diyAudio Member Join Date: Apr 2004 Location: .	are those paper magnifiers same as fresnel lenses ?

7th June 2004, 04:01 PM	#4
rcabezas diyAudio Member Join Date: May 2004 Location: NY State	They DO melt rather easily, I can attest to that..

9th June 2004, 01:01 AM	#5
boris333 diyAudio Member Join Date: Apr 2004 Location: .	i just got one of these http://www.buyonlinenow.com/viewprod...17C&source=ink i think it will work as fresnel what do u guys think ?

9th June 2004, 05:35 PM	#6
boris333 diyAudio Member Join Date: Apr 2004 Location: .	so what u guys think ?

9th June 2004, 05:53 PM	#7
rcabezas diyAudio Member Join Date: May 2004 Location: NY State	I honestly do not know what to say. If what you got is in fact a fresnel, then you overpayed incredibly. $130 for a fresnel?? If you read around these forums, you will find out that you can get fresnels a lot cheaper than that. Heck, you can even get a complete OHP on ebay for $25 and get the fresnel off of it. You can also find them on the web for $20-$40, and also several members here sell them.. Now, maybe the fresnel you got is ultra-high quality or something that would justify that price, I don't know. What's the focal length on it, anyway? Raf

9th June 2004, 09:04 PM	#8
boris333 diyAudio Member Join Date: Apr 2004 Location: .	i didn't pay $130 . i got it of ebay for $ 70 CND shipped .. i don't know what the focal length is ? the size is 10.5X13.5 ... can't wait on diylabs ... also u can get those tv magnifiers .. big fresnel .. but i don't know if this is gonna work i ll let u all know when i get it ..

10th June 2004, 05:07 AM	#9
rcabezas diyAudio Member Join Date: May 2004 Location: NY State	don't get the big tv fresnels, they are just page magnifiers (low quality fresnels). to find out the focal length you could focus the sun through the lens on the ground and measure how high you have it.

10th June 2004, 11:44 AM	#10
boris333 diyAudio Member Join Date: Apr 2004 Location: .	i didn't get a tv magnifier i m just saying that they are big .. i ll measure the focal length if it works ..

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