Fresnel alignment

Gilgamesh · 30th March 2005, 09:13 PM

Here is my lcd with the fresnels mounted. I'm just in the works to try to assemble it when the reflector is delivered(hopefully tomorrow). What I have understood will there be some kind of rings due to abberation in the fresnel lens, this is then solved by unfocusing the fresnel. So is this worth a go or will it definatly NOT work well?

Gilgamesh · 30th March 2005, 09:15 PM

Second image

dj_holmes · 30th March 2005, 09:44 PM

didn't really understand your question but....

1. split and unsplit fresnels give different results. each with its own benifits

2. you sometimes do pick up the fesnel lines when focusing. which you will have to adjust the fresnel to make it vanish! will affect your pj image thought!

3. good luck

SGSeeker · 30th March 2005, 10:39 PM

having the fresnels too close to the lcd will make it pick up the fresnel rings (since you're focusing on the lcd and the fresnels are so close, you'll get a "blurry" focus of the fresnel also. Moving the fresnel lenses further away from the lcd will fix the problem. If thats your lcd sandwiched between the fresnels, then you'll pick up the rings since they're too close to one another

ringram · 31st March 2005, 05:55 PM

so, what would be an average spacing of the fresnels from the lcd?

Gilgamesh · 1st April 2005, 12:32 AM

Thanks for the info, I might be back with my project in a few days

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30th March 2005, 09:44 PM	#3
dj_holmes diyAudio Member Join Date: Nov 2004 Location: london	didn't really understand your question but.... 1. split and unsplit fresnels give different results. each with its own benifits 2. you sometimes do pick up the fesnel lines when focusing. which you will have to adjust the fresnel to make it vanish! will affect your pj image thought! 3. good luck

30th March 2005, 10:39 PM	#4
SGSeeker diyAudio Member Join Date: Feb 2004 Location: WA	having the fresnels too close to the lcd will make it pick up the fresnel rings (since you're focusing on the lcd and the fresnels are so close, you'll get a "blurry" focus of the fresnel also. Moving the fresnel lenses further away from the lcd will fix the problem. If thats your lcd sandwiched between the fresnels, then you'll pick up the rings since they're too close to one another

31st March 2005, 05:55 PM	#5
ringram diyAudio Member Join Date: Jan 2004 Location: Winnipeg, Canada	so, what would be an average spacing of the fresnels from the lcd?

1st April 2005, 12:32 AM	#6
Gilgamesh diyAudio Member Join Date: Jan 2005 Location: Gothenburg	Thanks for the info, I might be back with my project in a few days

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