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Thread Tools |
8th February 2005, 12:48 AM
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#1 |
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diyAudio Member
Join Date: Aug 2004
Location: Blenheim - New Zealand
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Fresnell Focal with Condesnor
If you are using a condensor should the fresnell be 220mm away from the Condenser or still 220mm from the lamp arc? im assuming the latter?
I seem to suffering from dim corners and I cant work out why.
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mMmMmmMmmk? |
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8th February 2005, 04:05 AM
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#2 |
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diyAudio Member
Join Date: Apr 2004
Location: Vancouver, B.C.
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No it wont. For the fresnel lens to "see" the arc at its focal length, the arc needs to be just slightly closer than the focal length of the fresnel. The amount difference depends on the focal length of the condensor and the bulb-condensor difference.
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