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S15 Triplet Used With 650mm Fresnel...

#1 User is offline   Duranza 

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Posted 13 November 2006 - 10:00 PM

Can this combination work with a 17" monitor.. Pro fresnels with S15 Triplet? Or do the objective lens and fresnel have to be the same Focal Length?
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#2 User is offline   dslod18 

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Posted 13 November 2006 - 10:17 PM

View PostDuranza, on Nov 13 2006, 05:00 PM, said:

Can this combination work with a 17" monitor.. Pro fresnels with S15 Triplet? Or do the objective lens and fresnel have to be the same Focal Length?


The field fresnel and triplet need to be approximately the same focal length to get an evenly focused and lit projection. If you try using a 650mm fresnel with the LL standard triplet, the size of the light cone at the triplet's focal point will still be too big to fit inside the triplet.
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#3 User is offline   tameone 

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Posted 13 November 2006 - 10:18 PM

View Postdslod18, on Nov 13 2006, 05:17 PM, said:

The field fresnel and triplet need to be approximately the same focal length to get an evenly focused and lit projection. If you try using a 650mm fresnel with the LL standard triplet, the size of the light cone at the triplet's focal point will still be too big to fit inside the triplet.



what he said.. the results would not be good.. not good at all. standard triplet needs 317 or 330mm field fresnel
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#4 User is offline   computercowboy 

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Posted 13 November 2006 - 10:56 PM

View PostDuranza, on Nov 13 2006, 05:00 PM, said:

Can this combination work with a 17" monitor.. Pro fresnels with S15 Triplet? Or do the objective lens and fresnel have to be the same Focal Length?



You wan the Large Fresnels from 3dlens.com

you need a 395a and a 395b
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#5 User is offline   tameone 

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Posted 14 November 2006 - 12:37 AM

View Postcomputercowboy, on Nov 13 2006, 05:56 PM, said:

You wan the Large Fresnels from 3dlens.com

you need a 395a and a 395b



er right.. I've been getting lazy recently and leaving out details :)
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#6 User is offline   computercowboy 

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Posted 14 November 2006 - 12:40 AM

View Posttameone, on Nov 13 2006, 07:37 PM, said:

er right.. I've been getting lazy recently and leaving out details :)


Thats ok! It seems I am ranked Obsesive Compulsive right now so I can take care of some of the details.
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#7 User is offline   Duranza 

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Posted 14 November 2006 - 01:01 PM

Thanks alot!!! I almost made the mistake without asking first..
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