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What size lens should I get for my projector? Answered

I found the following video:
https://www.youtube.com/watch?v=JdJ1gZDb6gM

And I want to make a $100 1280x800 projector. In the comment section in that video he says he used a 120mm fresnel lens for the back (Focusing the 100W LED to the 5.6" LCD) and a 220mm fresnel lens for the front (Focusing the LCD to the wall). I want to make sure that I get the right lens. 

Here is the site I am probably going to buy from:
http://www.bhlens.com/fresnel_lens.aspx

I might even post an article that links to their site so I can get the lens for free.

Lastly, I'd like to say that I want it to as small as possible (Hence the reason for getting a not-so-common 5.6" LCD instead of a common 7"). Please help me choose a lens that will allow for the smallest possible space between the LCD, lenses, and light. I will make an Instructable for this later on. 


4 Replies

user
iceng (author)2015-04-03

Your link to BHLens showed $3000 lens cost ?!??

Are they joking ?

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user
iceng (author)knexpert17002015-04-03

Got it "Price: $3.000" is $3.oo

They are an international company .... explains the third digit.

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user
knexpert1700 (author)2015-04-03

Nevermind: I found a guide for choosing a lens and found that BHPA120-2 fits very nicely with this 5.6" display.

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