| OBSERVACIONES | The normal optical system (the lens with a fixed focal length) has a fixed number of lens elements, and all of them have a fixed distance between them. A zoom lens has a fixed number of lens elements, but here the distances between elements can change. A third category of designs is the multi-configuration design. Here the number of lens elements do change, but the distances between them are fixed. The Apo-Telyt-R module system belongs to this last category. The multi-configuration design has nothing to do with the so-called convertible lenses (Satz Objektive). In this latter design we encounter two lens elements or doublets (A and B) with almost identical specification, but different power of magnification, that can be used together or separately, delivering three possible configurations (A, B and AB) and therefore three different focal lengths. The starting point of the Module system was the layout of the Apo-Telyt-R 280 mm f/2.8 and Apo-Telyt-R 400 mm f/2.8. The former has a front group of three elements and a second group of 5 elements. The 400mm system has a front group of four elements, a middle group of two and a third group of 5 elements, including the lens group for the internal focusing. If we cut both lenses in two segments and regroup the front and middle section of the 400 lens, we see the contours of the module system. The three element front group of the 280mm lens becomes the smaller module head with 125mm diameter. The rearranged first and second group of the 400mm become the larger module head with 157mm diameter. The focus module 2.8/280/400 is derived from the last group of the 280mm lens. And the focus modules 4/400/560 and 5.6/560/800 are derived from the rear group of the 400mm lens. |
| CARACTERISTICAS TÉCNICAS | Longitud focal y luminosidad: 560 mm F/5.6 Angulo de visión: 4.5º Elementos/Grupos del objetivo: 9/7 Abertura mínima 22 Gama de enfoque (en metros) 2.15 a infinito Area minima de la imagen (en mm) 75x113 Tamaño del filtro recomendado Serie 6 Longitud 374 mm Diametro maximo 123 mm Peso 3900 gr |
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