What does this mean.

juice_e · 19th January 2006, 11:03 PM

I have attached an image on this post of what i got so far. I have all the lenses and bulbs etc in place, i tooke a pic of a somewhat screen and i got alot of liens branching outwards from the middle which is comming from the fresnels, but isnt the actual fresnel grooves that you get from putting it too close to the LCD. Also in the picture, the LCD is NOT in because i cannot hook up to a source yet. If i put the LCD in place will that get rid of the lines or is this caused by something else. I hooked up the LCD before and focused an image of a box on the screen that says no input device detected and it focused very well but you can slightly see those lines on the white writting. Anyone know what is causeing it?

I added 2 pictures, both are the same but the one that looks more green is when the bulb wasnt warmed up that long and the other ones has some other colours comming in and that is when the bulb was on for about 5 minutes.

juice_e · 19th January 2006, 11:04 PM

second one

Whatmo · 20th January 2006, 06:05 AM

What is the projection lens that you are using? Try to get the arc of your bulb in focus and see if it is still green. If it is it may be that your lens isn't corrected for abberration.

juice_e · 20th January 2006, 06:21 AM

How do i get the arc in focus, im not really sure what you mean?

Also, its not really that green, just a tiny bit. It s pretty much the camera that makes it look more green. Im more worried about those spiral looking lines comming out from the middle and that im not getting even light distribution, just a circle sort of .

superdaveumo · 20th January 2006, 03:28 PM

I would guess those lines are the result of the arc reflecting off of your reflector? There is no LCD in there so that's not the culprit. I'd say just focus the arc. Do this by adjusting the fresnels until you get a nice picture of your arc (from the bulb) on your wall. Then slap that LCD in (at the right distance) and go to town!

snortonnorton · 20th January 2006, 03:37 PM

wait, what do you mean focus till you can SEE the arc on the screen. isnt' the fresnel supposed to diffuse the light evenly on the screen withn no hot spots? seeing the arc is seeing a hot spot right?

juice_e · 20th January 2006, 05:03 PM

I dont have a reflector in yet either but nothing is painted blaack yet so could that be it?

Ya, i was thinking the same thing as snortonnorton, wont that mean that gives me a gross hotspot if i do that.

snortonnorton · 20th January 2006, 05:28 PM

yeah, but i'm thinking the lcd itself will also spread out some of the light.

what is your distance from the bulb to the fresnel?

and maybe you should try it with the lcd first before you change too much.

juice_e · 20th January 2006, 08:13 PM

Its 220mm from arc to first fresnel and im using the unplit design so both are together, lcd 20-30 mm aprox. after. the pj lens is about 14.86" i think i calculated it to be but its on a sliding piece so i can move it further or closer.

An d about the lcd, i cant put it in just yet because i need to hook it to my computer because i need a somewhat white screen because now all it is is black and it looks fine, until i take it out and see what is in the pictures.....

dnsey · 20th January 2006, 08:35 PM

Quote:

o this by adjusting the fresnels until you get a nice picture of your arc (from the bulb) on your wall.

The image of the arc should be focussed at the optical centre of the objective lens. The lens should in turn be focussed on the LCD.

20th January 2006, 06:21 AM	#4
juice_e diyAudio Member Join Date: Apr 2005 Location: Ontario, Canada	How do i get the arc in focus, im not really sure what you mean? Also, its not really that green, just a tiny bit. It s pretty much the camera that makes it look more green. Im more worried about those spiral looking lines comming out from the middle and that im not getting even light distribution, just a circle sort of . __________________ justin

20th January 2006, 05:03 PM	#7
juice_e diyAudio Member Join Date: Apr 2005 Location: Ontario, Canada	I dont have a reflector in yet either but nothing is painted blaack yet so could that be it? Ya, i was thinking the same thing as snortonnorton, wont that mean that gives me a gross hotspot if i do that. __________________ justin

20th January 2006, 08:13 PM	#9
juice_e diyAudio Member Join Date: Apr 2005 Location: Ontario, Canada	Its 220mm from arc to first fresnel and im using the unplit design so both are together, lcd 20-30 mm aprox. after. the pj lens is about 14.86" i think i calculated it to be but its on a sliding piece so i can move it further or closer. An d about the lcd, i cant put it in just yet because i need to hook it to my computer because i need a somewhat white screen because now all it is is black and it looks fine, until i take it out and see what is in the pictures..... __________________ justin

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20th January 2006, 06:05 AM	#3
Whatmo diyAudio Member Join Date: Aug 2005	What is the projection lens that you are using? Try to get the arc of your bulb in focus and see if it is still green. If it is it may be that your lens isn't corrected for abberration.

20th January 2006, 03:28 PM	#5
superdaveumo diyAudio Member Join Date: Jul 2005 Location: Colorado	I would guess those lines are the result of the arc reflecting off of your reflector? There is no LCD in there so that's not the culprit. I'd say just focus the arc. Do this by adjusting the fresnels until you get a nice picture of your arc (from the bulb) on your wall. Then slap that LCD in (at the right distance) and go to town!

20th January 2006, 03:37 PM	#6
snortonnorton diyAudio Member Join Date: Dec 2005 Location: tallahassee	wait, what do you mean focus till you can SEE the arc on the screen. isnt' the fresnel supposed to diffuse the light evenly on the screen withn no hot spots? seeing the arc is seeing a hot spot right?

20th January 2006, 05:28 PM	#8
snortonnorton diyAudio Member Join Date: Dec 2005 Location: tallahassee	yeah, but i'm thinking the lcd itself will also spread out some of the light. what is your distance from the bulb to the fresnel? and maybe you should try it with the lcd first before you change too much.

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