3/45 bat tery - + LED 4000 851 741 4000 851 740 Unless otherwise stated, delivery without content/ accessories. The offers are only valid for commercial customers. All prices excluding VAT. Measuring instruments Convex lenses are also called converging lenses, because they act to converge a parallel light beam at a single point, the focal point. Biconvex is a lens that curves outwards on both sides. In plano-convex lenses, only one surface of the lens is spherically curved and the opposite side is flat. Biconvex lenses are predominantly manufactured using glass. They have a radius (spherical) that extends over the entire surface of the lens. Biconvex lenses are commonly used in magnifiers, as they provide a better image quality at a higher magnification. In contrast to a lens with a spherical radius (e.g. biconvex lens), an aspherical lens has a different radius at each point of the lens. The different curvature of the lens surface significantly improves the image quality of the lens, especially at the edge. Most aspherical lenses are plastic lenses, as this allows very complicated lens geometries to be manufactured relatively easily using the injection moulding process. By contrast, aspherical glass lenses often have a very difficult manufacturing process and are therefore only used in special magnifiers. The figure on the left shows an aspherical plano-convex lens in which one side has an aspherical surface and the other is flat. An aplanatic lens system consists of two plano-convex lenses, which provides sharpness at the edges and distortionfree images. It is comprised of two plano-convex lenses that are arranged with their curved (convex) sides facing each other. These plano-convex lenses are predominantly manufactured from glass. Spherical lenses, i.e. lenses with a single radius, are used. Aplanatic lens systems, as shown in the figure on the left, are used in magnifiers with exceptional imaging properties right up to the edge. These kinds of magnifiers differ from ‘standard’ magnifiers with biconvex lenses due to the significantly better imaging properties, as the distortions that usually arise at the edges are completely eliminated. Apochromatic lens systems combine the sharp imaging at the edges of an aplanatic lens with the colour correction of an achromatic lens. These kinds of lens systems are used in scale magnifiers that require sharp imaging at the edges as well as colour-corrected imaging. Magnification Lens Ø [mm] Type Article no. EUR CK 2.5-way 70 With 8 LEDs 4000 901 351 18,95 PX08 Reading magnifier with light With 8 LEDs · Particularly light-fast · Long, easy-grip handle · Ergonomic light switch · Quality lens made of scratch-resistant glass · Operation with 2 Mignon cells Batteries are not included in the scope of supply For replacement batteries, see article no. 4000 901 811 Magnification Lens Ø [mm] Handle design Article no. EUR CK 2x/4x 90/20 Plastic 4000 851 740 82,95 ZK11 4x 65 Plastic 4000 851 741 61,95 ZK11 8x 28 Metal 4000 851 695 47,95 ZK11 10x 28 Metal 4000 851 742 45,95 ZK11 Hand-held magnifying glass Tech-Line With high-precision aplanatic glass lens 4000 851 695 / 4000 851 742
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