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20th January 2004, 12:50 PM
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#1 |
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diyAudio Member
Join Date: Jan 2004
Location: France
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A question of size ...
Hi Everybody,
I 've just started to build a DIY video projector and i now wondering about how to reduce the video displayed on the projection screen. (it's really too large !!!) Do you know if a trick exist ? Thank you very much for your help and good luck in your project... |
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20th January 2004, 08:25 PM
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#2 |
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diyAudio Member
Join Date: Dec 2003
Location: in a hole
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Buy a new objective lens with a longer focal length.
Use Brainchild's handy figurer on the Lumenlab site to easily find the focal length u need. |
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20th January 2004, 08:34 PM
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#3 |
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diyAudio Member
Join Date: Aug 2003
Location: east coast
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It's a little more complicated, you'll need a matching field fresnel too. If you go with a 500mm pj lens you'll need some thing like a 520mm fresnel.
__________________
DIY Video Projector Guide: http://lumenlab.com/forums |
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