fresnel bugs...

Alex_Fure · 13th March 2005, 08:37 PM

Does everybody have those annoying black rings from fresnels projected on the screen? I've seen some threads on this, but very few people participated in those dicussions... So do all fresnels have this bug or only the bad ones? if I do a split fresnel design, will those rings disappear?

Inkog · 13th March 2005, 08:47 PM

I have read about people being able to see the rings from fresnels before and the solution was to move them further from the LCD. Worth a shot at least.

Good luck

SGSeeker · 13th March 2005, 10:39 PM

yeah, you just have to move then further away from the lcd and focus on the lcd. The rings you see is the lens focusing partially on the fresnel

ancorp · 13th March 2005, 10:48 PM

Yeah, I second that...

Hey, Welcome to the Forum! Great to see someone from Ukraine

part2wanksta · 13th March 2005, 11:22 PM

i dont know if just moving it will help all that much.

it sounds like you are using a split fresnel design.

to not get the lines they fresnels have to be perfectly aligned.

thats why may people put 2 fresnels before the lcd

13th March 2005, 08:37 PM	#1
Alex_Fure diyAudio Member Join Date: Mar 2005 Location: Crimes	fresnel bugs... Does everybody have those annoying black rings from fresnels projected on the screen? I've seen some threads on this, but very few people participated in those dicussions... So do all fresnels have this bug or only the bad ones? if I do a split fresnel design, will those rings disappear?

13th March 2005, 10:48 PM	#4
ancorp diyAudio Member Join Date: Jun 2004 Location: Vaughan, Ontario (near Toronto)	Yeah, I second that... Hey, Welcome to the Forum! Great to see someone from Ukraine __________________ Currently used display: NEC XG110 HDTV CRT Projector 90" lenticular silver screen Current Audio setup: Fronts - Realistic Mach One (FREE!!!) Sansui SP- 5500x (with new woofers - free woofers!!!) Center - dB+ studio monitor Rears - Kenwood LS 70's Hitachi HSP-MS53's Sub - Acoustech Labs S100ETH AMP - Insignia IS-HC040917 (cheap but does the job) Gotta love 4 15" woofers!!!

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13th March 2005, 08:47 PM	#2
Inkog diyAudio Member Join Date: Dec 2004 Location: Louisville, KY	I have read about people being able to see the rings from fresnels before and the solution was to move them further from the LCD. Worth a shot at least. Good luck

13th March 2005, 10:39 PM	#3
SGSeeker diyAudio Member Join Date: Feb 2004 Location: WA	yeah, you just have to move then further away from the lcd and focus on the lcd. The rings you see is the lens focusing partially on the fresnel

13th March 2005, 11:22 PM	#5
part2wanksta diyAudio Member Join Date: Aug 2003 Location: new mexico	i dont know if just moving it will help all that much. it sounds like you are using a split fresnel design. to not get the lines they fresnels have to be perfectly aligned. thats why may people put 2 fresnels before the lcd

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