What does this mean. - Page 2

skullkeeper · 21st January 2006, 02:00 AM

whats the focal l of your lens

juice_e · 21st January 2006, 07:36 AM

Focal length is 327mm .....Lumenlab lens.......

skullkeeper · 21st January 2006, 06:03 PM

you could try moving your lens closer. you sayed its 14.86" away 327mm is just over 12"

try this

http://www.industrial-enclosures.com...n-mm-inch.html

juice_e · 22nd January 2006, 01:27 AM

I used all the conversion tools. And about moving the lens , i do, i have it on a slide so i can move it from 5mm to 17mm ish.. And when i move it, it still doesnt make a difference with the problems with the light.
Thanks for that url though, thats what i needed a month ago

skullkeeper · 22nd January 2006, 03:19 AM

the site is a big help i found it on google sence i dont know mm its a big help. maybe try shining a flashlight through your lens see if it puts out a green then if so your lens may have a greenish tint maybe.

my1423 · 22nd January 2006, 03:38 AM

Stupid question.
Did you remove the green tinted film from your lexan?
Also try moving your lens away from the fresnel just a bit. May be close to being focused in infinity and that is where your getting the spiral lines. Very slight bend in fresnel causing slight diferance in outer pattern. Or you accedently got your fresnels swapped.

Cal Weldon · 22nd January 2006, 03:44 AM

Moderation is a necessary nuisance. Thanks for your patience.

my1423 · 22nd January 2006, 03:59 AM

No Problem. You got to it almost immeadiadtly and it is a nessearry evil I guess. Just an inconveniance. Thanks

juice_e · 22nd January 2006, 06:03 AM

Quote:

Originally posted by my1423
Stupid question.
Did you remove the green tinted film from your lexan?
Also try moving your lens away from the fresnel just a bit. May be close to being focused in infinity and that is where your getting the spiral lines. Very slight bend in fresnel causing slight diferance in outer pattern. Or you accedently got your fresnels swapped.

Actually i just tested this once for 10 minutes and i didnt put the lexan in yet so thats not it but at first i thought i did that. I only tested it for 10 min kuz without the lexan, i didnt want to damage the fresnels. The fresnels are not swapped, i triple checked that too after.... What a pickle!

Guy Grotke · 22nd January 2006, 12:21 PM

This is caused by have a slight misalignment of the two fresnel centers. You see a pattern of cancelled and reinforced light made where the rings in one fresnel interfere with the action of the rings in the other. I have seen a pattern that looks like a Japanese flag too. Shuffle one of those fresnels around a bit, relative to the other fresnel, until the pattern goes away. Or you can just space them 10 mm apart, and avoid the problem entirely.

You do need to run a new MH lamp for a while before it stabilizes. Some of the colors may fade out once it really gets going. Try running it for 20 minutes.

21st January 2006, 07:36 AM	#12
juice_e diyAudio Member Join Date: Apr 2005 Location: Ontario, Canada	Focal length is 327mm .....Lumenlab lens....... __________________ justin

22nd January 2006, 01:27 AM	#14
juice_e diyAudio Member Join Date: Apr 2005 Location: Ontario, Canada	I used all the conversion tools. And about moving the lens , i do, i have it on a slide so i can move it from 5mm to 17mm ish.. And when i move it, it still doesnt make a difference with the problems with the light. Thanks for that url though, thats what i needed a month ago __________________ justin

22nd January 2006, 03:44 AM	#17
Cal Weldon diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Moderation is a necessary nuisance. Thanks for your patience. __________________ Read dozens of books about heroes and crooks and I learned much from both of their styles. (JB)

22nd January 2006, 12:21 PM	#20
Guy Grotke diyAudio Member Join Date: Sep 2004 Location: Vista, CA	spiral interference pattern This is caused by have a slight misalignment of the two fresnel centers. You see a pattern of cancelled and reinforced light made where the rings in one fresnel interfere with the action of the rings in the other. I have seen a pattern that looks like a Japanese flag too. Shuffle one of those fresnels around a bit, relative to the other fresnel, until the pattern goes away. Or you can just space them 10 mm apart, and avoid the problem entirely. You do need to run a new MH lamp for a while before it stabilizes. Some of the colors may fade out once it really gets going. Try running it for 20 minutes.

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21st January 2006, 02:00 AM	#11
skullkeeper diyAudio Member Join Date: Apr 2005 Location: tucson,AZ	whats the focal l of your lens

21st January 2006, 06:03 PM	#13
skullkeeper diyAudio Member Join Date: Apr 2005 Location: tucson,AZ	you could try moving your lens closer. you sayed its 14.86" away 327mm is just over 12" try this http://www.industrial-enclosures.com...n-mm-inch.html

22nd January 2006, 03:19 AM	#15
skullkeeper diyAudio Member Join Date: Apr 2005 Location: tucson,AZ	the site is a big help i found it on google sence i dont know mm its a big help. maybe try shining a flashlight through your lens see if it puts out a green then if so your lens may have a greenish tint maybe.

22nd January 2006, 03:38 AM	#16
my1423 diyAudio Member Join Date: Jan 2006 Location: az	Stupid question. Did you remove the green tinted film from your lexan? Also try moving your lens away from the fresnel just a bit. May be close to being focused in infinity and that is where your getting the spiral lines. Very slight bend in fresnel causing slight diferance in outer pattern. Or you accedently got your fresnels swapped.

22nd January 2006, 03:59 AM	#18
my1423 diyAudio Member Join Date: Jan 2006 Location: az	No Problem. You got to it almost immeadiadtly and it is a nessearry evil I guess. Just an inconveniance. Thanks

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