Lumenlab: Will Be The Thickness Of The Fresnel.... - Lumenlab

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Will Be The Thickness Of The Fresnel....

#1 User is offline   samsagaz 

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Posted 11 July 2006 - 04:04 PM

hey guys, someone know if the Thickness of the fresnel will modify the focus or image quality?

i see that LL sell with 2mm Thickness, and i found some of 4mm, will be the same (the focus are the same)
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#2 User is offline   Durachko 

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Posted 11 July 2006 - 04:12 PM

I'm quite certain you needn't be overly worried about thickness but the optical quality of the material from which the lens is made can definitely make a difference.
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#3 User is offline   mikyd1954 

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Posted 11 July 2006 - 04:34 PM

are you sure that the 4mm fresnel is not a dual focus fresnel? thats the only ones I have seen that are 4mm thick (what some overheads use, the original meaning of "splitting fresnels" I believe was when the 2 conjoined fresnels were actually split in two, but that could be urban legend too :) )
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#4 User is offline   Durachko 

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Posted 11 July 2006 - 04:42 PM

Interesting. How are they joined? Can they be cut? Are they a hassle to work with? It would eliminate the alignment problem some have - right? Of course, you can't go with a split design if they are permanently stuck together.
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#5 User is offline   mikyd1954 

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Posted 11 July 2006 - 06:05 PM

View PostDurachko, on Jul 11 2006, 11:42 AM, said:

Interesting. How are they joined? Can they be cut? Are they a hassle to work with? It would eliminate the alignment problem some have - right? Of course, you can't go with a split design if they are permanently stuck together.

not sure, I think they are "welded" at the edges(the old ones anyway), the problem being that they were meant for overheads which means generally 10x10 0r 11.25x11,25 stages.... maybe some of the "old folks" around here would know....
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#6 User is offline   kiat 

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Posted 12 July 2006 - 10:36 AM

They are welded at the adges together. That why they are 4 mm. thickness, and it's easy to separate them by sharp knife, or cutting around the adges. :)
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#7 User is offline   senior_technician 

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Posted 12 July 2006 - 05:15 PM

Yes, they are commonly used in overhead projectors (I have a set that is 220/330mm.) And, yes, they are a little too small to use with a 15 inch lcd.
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