Comparing these 17" Projector design

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tempoct

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Joined 2006
#1
Projection lens FL = 500mm

#1
Condensor Fresnel :220mm
Field Fresnel: 650mm

#2
Condensor Fresnel :330mm
Field Fresnel: 330mm

What's pro/cons different of those setup? How does the diameter of projection lens would make different if they are the same focal length? (Says 10cm and 13.5cm).

Thanks for any comment.
 
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