What does it mean for a Fresnel lens to have two finite conjugates?
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With a double finite conjugate Fresnel lens, you should still be able to focus collimated light to a point at the focal length ..
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I'm in a situation where I need to reverse engineer a product that my company already manufactures and sells, but it wasdesigned too long ago for anyone to remember. It uses a Fresnel lens with the given specifications:
Focal Length: 391.2mm
Facet Spacing: 0.508mm
Fresnel Conjugate: 6096.0mm
Plano Conjugate: 419.0mm
Clear Aperture: 457.2mm
What I don't understand is: what makes this double finite conjugate lens different from one with a single finite conjugate?
With a double finite conjugate Fresnel lens, you should still be able to focus collimated light to a point at the focal length, right? I just want to know why some Fresnel lenses are specified with two finite conjugates while others have infinite conjugates. Are the grooves made to accept a certain range of angles depending on the conjugate length specified?
Focal Length: 391.2mm
Facet Spacing: 0.508mm
Fresnel Conjugate: 6096.0mm
Plano Conjugate: 419.0mm
Clear Aperture: 457.2mm
What I don't understand is: what makes this double finite conjugate lens different from one with a single finite conjugate?
With a double finite conjugate Fresnel lens, you should still be able to focus collimated light to a point at the focal length, right? I just want to know why some Fresnel lenses are specified with two finite conjugates while others have infinite conjugates. Are the grooves made to accept a certain range of angles depending on the conjugate length specified?
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