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Nikkor
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===EL-Nikkor=== The EL-Nikkor series of lenses are designed for [[photographic enlarger]]s. Most feature 39mm Leica thread mounts, although some feature a 50mm screw mount. Most are 6-element, 4-group designs. Some slower, lower-cost designs (marked β ) are 4-element, 3-group designs. Newer versions of these lenses are marked with an "N" (focal lengths to 105mm) or "A" (focal lengths from 135mm). (Per Nikon, Inc. Technical and Service Support (800-645-6689), manufacture and sale of all enlarging lenses has been discontinued.) * EL-Nikkor 40mmF4 * EL-Nikkor 5cmF2.8/50mmF2.8 (Release of drawing Year : 1956) - M39 Screw Mount. * EL-Nikkor 5cmF3.5C - "El-NIKKOR-C" * EL-Nikkor 5cmF3.5 (Release of drawing Year : 1945) * EL-Nikkor 50mmF4<sup>β </sup> (Release of drawing Year : 1967) - M39 Screw Mount. * Helmes 5.5cmF3.5 (Release of drawing Year : 1936) - Tessar Type * EL-Nikkor 63mmF2.8 * EL-Nikkor 6.3 cm/63mmF3.5(Sale Year : 1966) - M39 Screw Mount. * EL-Nikkor 68mmF3.5 - M39 Screw Mount. * EL-Nikkor 75mmF4 <sup>β </sup> * EL-Nikkor 80mmF5.6 (introduced in 1966) - M39 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 105mmF5.6 (introduced in 1966) - M39 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 135mmF5.6 (introduced in 1966) - M39 Screw Mount & Ο45mmP=0.5 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 150mmF5.6 (introduced in 1968) - Ο53mmP=0.75 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 180mmF5.6 (introduced in 1972) - Ο62mmP=1 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 210mmF5.6 (introduced in 1968) - Ο72mmP=1 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 240mmF5.6 (introduced in 1972) - Ο82mmP=1 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 300mmF5.6 (introduced in 1972) - Ο100mmP=1 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens) * EL-Nikkor 360mmF5.6 (introduced in 1972) - Ο130mmP=1.5 Screw Mount. (6 elements in 4 groups / Orthometar Type Lens)
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