focus problems

shredator · 29th May 2006, 06:19 AM

I just finished putting my projector together. I used a 400w ushio, 220mm fl fresnel, 550fl fresnel, daewoo 17" (L1711MN) and a LumenLab pro triplet. Im staisfied with the colors and the brightness, but I cannot get the corners and the center to focus at the same time. Anyone have any insight?
thanks,
Kalen

milihpen · 29th May 2006, 08:41 PM

Are you sure you have your lens centered on where the arc's image is? I messed up on calculating that once. The image ended up being out of focus, especially in the bottom corners. I ended up making sure that my lamp, fresnels, lcd, and pj lens were all centered, using a level laser. That really helped.

Also, are you sure you have all your distances correct? Also, sometimes tweaking them, even in the "wrong" direction, can help.

I have a regular lens with a 17", and I've got pretty nicely focused corners and center (not perfect yet, but close enough so that I can see individual pixels all the way to two of the corners and almost all the way to the other two. Then again, I have a 330 mm fresnel between my lamp and lcd. I've heard that helps with even brightness, but I don't know about focus.

I hope this somehow helps.

29th May 2006, 06:19 AM	#1
shredator diyAudio Member Join Date: Jan 2006 Location: santa cruz CA	focus problems I just finished putting my projector together. I used a 400w ushio, 220mm fl fresnel, 550fl fresnel, daewoo 17" (L1711MN) and a LumenLab pro triplet. Im staisfied with the colors and the brightness, but I cannot get the corners and the center to focus at the same time. Anyone have any insight? thanks, Kalen

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29th May 2006, 08:41 PM	#2
milihpen diyAudio Member Join Date: Dec 2005 Location: USA	Are you sure you have your lens centered on where the arc's image is? I messed up on calculating that once. The image ended up being out of focus, especially in the bottom corners. I ended up making sure that my lamp, fresnels, lcd, and pj lens were all centered, using a level laser. That really helped. Also, are you sure you have all your distances correct? Also, sometimes tweaking them, even in the "wrong" direction, can help. I have a regular lens with a 17", and I've got pretty nicely focused corners and center (not perfect yet, but close enough so that I can see individual pixels all the way to two of the corners and almost all the way to the other two. Then again, I have a 330 mm fresnel between my lamp and lcd. I've heard that helps with even brightness, but I don't know about focus. I hope this somehow helps.

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