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ROLYN Aspheric Lenses are highest quality molded and fire polished lenses, designed to minimize spherical aberrations which are of major concern in condensing systems.
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A Bi-Concave Lens is a divergent or negative lens, thicker at the edge than in the center. All ROLYN Bi- Concave Lenses are symmetrical having equal radii on both sides. These lenses form a virtual image and are frequently used to extend the effective focal length of a converging lens when they are used as a pair.
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A Bi-Convex lens is a convergent or positive lens, thicker in the center than at the edges. ROLYN Bi-Convex Lenses are all symmetrical, having equal radii on both sides. Aberrations in such lenses are at a minimum when the object/image ratio is 1:1. Typical applications are: magnifiers, objectives, some condensing systems.
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With one cylindrical surface, these lenses have a focal line rather than a focal point and act as a flat plate along the axis dimensioned "A". Typically used to image slits and other long narrow fields.
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A series of concentric grooves on a flat, thin piece of plastic makes possible a large diameter, lightweight and inexpensive lens with a short focal length. Each groove acts as a minute refracting facet capable of bending light, thus giving greater transmittance than a conventional lens of the same focal length. Material is Acrylic with transmission of 92% throughout the visible spectrum. Maximum service temperature is 80°C. Rolyn fresnel lenses are corrected for spherical aberration.
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A negative or divergent meniscus lens is also convex-concave, but is thinner at the center than at the edges. Otherwise description is similar to plano-concave lenses.
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A Plano-Concave Lens is a divergent or negative lens, thicker at the edge than in the center and flat on one side. It forms a virtual image and is frequently used to extend the effective focal length of a converging lens when they are used as a pair. We suggest that negative focal lengths be stated in order.
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A positive or convergent meniscus lens is a convex-concave lens thicker at the center than at the edges. They are felt polished and are used universally in the ophthalmic industry where convention dictates that lens power be specified in Diopters. For your convenience we have also specified the focal length in millimeters for all ROLYN Meniscus Lenses.
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A Plano-Convex lens is a convergent or positive lens with one flat side and is thicker in the center than at the edges. Aberrations are at a minimum when used with parallel incident light as shown. Typical applications are: eyepieces, magnifiers, condenser systems, inexpensive microscopes, etc.
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Precision molded Polymer Aspheric Lens for infinity conjugates in both 12.7 and 25.4mm diameters. All 12.7mm dia lenses have an 11.4mm clear aperture. All 25.4 diameter lenses have a 23.9mm clear aperture
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