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Old 24th October 2006, 09:06 AM   #31
budhi is offline budhi  India
diyAudio Member
 
Join Date: Aug 2005
Default Finding fresnel!

pcaddict,
let me share some jugaad with you all
Dont get stuck with the single fresnelor no fresnel problemFresnel is required to intensify or collect the lightand send it to the Lcd then stop it from scattering once again and send it to the projection lens,it actually increases the intensity a lot you will have to buy a double power bulb if you dont use a fresnel which means double heat weight powerconsumtion and other problems.
The final image depends on the quality of the main fresnel this is the one in front of the lcd (between lcd and lens) Use your good fresnel for this.use an ordinary fresnel available in stationary shops in A3 size for about Rs 100/-!!!! as the lens required to condense light, these are called Page magnifiers or map magnifiers only problem is they are not very think so you will need to make a simple plastic or wooden frame to support it tight.
And Remember the most important thing-All fresnel grooves have to point away from the lcd (plain side towards the LCD) otherwise you are doing more harm than good ie scattering the light, instead of collecting it.
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Old 24th October 2006, 06:01 PM   #32
mastero is offline mastero  India
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Join Date: Apr 2006
Location: jmhj
Hello all,

After doin intense search and research .. i have found a supplier in India for Optical Acrylic Fresnel lens 220mm FL and 330mmm FL and triplet lens with 315mm FL. (Barrel dia 74mm)

Its a perfect match.

I am waiting for my set ..... will let you all know how it is..

Cheers
Mastero
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Old 26th October 2006, 07:50 AM   #33
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Join Date: Jun 2005
Location: n/a
Hi budhi

Please can you tell where you got the parabolic reflector

Thanks
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Old 26th October 2006, 09:35 AM   #34
budhi is offline budhi  India
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Join Date: Aug 2005
Hi cromaclear-crt
I got the parabolic reflector from the local lights shop, all light fittings whether they are fluroscent or halogen or metal hallide come with mirror polished reflectors in metal, you can even buy spares, but you might have to make adjustments for your bulb size.
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Old 26th October 2006, 09:45 AM   #35
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Join Date: Oct 2006
Hi Maks,

Im also from Bangalore...
Can u tell amy place where i can get Mettal halide lamps and the ballast for it?


Thanks,
Cool
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Old 26th October 2006, 12:12 PM   #36
diyAudio Member
 
Join Date: Oct 2006
Unhappy fresnel lence

sir can i get address of the place from where i can get the fresnel lence please please
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Old 27th October 2006, 10:58 AM   #37
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Join Date: Oct 2006
Hi All,

Can you please give me the specifications for the fresnel lens, the condensor lens and the final Focusing Lens?

Wats the diameter, width, height, focal length any other specifications etc....

Does anybody where in bangalore we get all these cheaply?


Thanks,
Cool
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Old 28th October 2006, 10:16 AM   #38
budhi is offline budhi  India
diyAudio Member
 
Join Date: Aug 2005
Default Important Info For All Builders Very Useful

this is link to the calculator that lets you figure out what you will get if you put all the things you have, together.
Mind the units carefully otherwise you can land up with way off figures!!

http://www.diyprojectorcompany.com/t...calculator.htm
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Old 28th October 2006, 01:04 PM   #39
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Join Date: Jul 2005
Location: 404 Not Found
hi budhi,

Yes, i bought the page magnifier lens and it cost 120/- here in chennai. Can you tell me again, where to place this lens between (light & LCd) OR (LCD and triplet).

Also, u say smooth side should see the LCd, am I correct?????
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Old 28th October 2006, 01:29 PM   #40
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Join Date: Jul 2005
Location: 404 Not Found
The lens that I am using is not triplet...but some other thing.....from local crap market.....it doesn't seem work good.


Can you see where the triplet lens is available...is it available in local photo camera optic stores...

Or, should it be bought from US...
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