With an 8x zoom, a useful wide angle setting of 12.5mm and the Aspheron 6.5 mm optical attachment, this is a multi-purpose lens. It has built-in TTL exposure meter and power zoom with variable speeds. The lens has 19 elements and is multicoated (MC), so that an overall increase in contrast has been achieved, resulting in better shots, particularly when filming against the light. The most important technical features: Horizontal field angle from 41° (752‰ ) to 5 1/2° (96‰ ). With Aspheron 72° (1450‰). Geometric apertures from f/2 to f/16, with mark for photometric apertures (T-stop). Focusing from 4 ft (1.2 m) to infinity. A special control makes it possible to focus sharply at very short distances, particularly necessary when using the aspheron wide-angle attachment. The Aspheron was designed especially for use with the Vario-Switar 100 PTL and, even with the diaphragm fully open, has a focusing range from 39 in (1 m ) to infinity and is practically distortion free. Two-blade automatic diaphragm — can also be set manually — with Cds photo-electric cell in the lens behind the zoom variator and center-weighted measuring field over two-thirds of the image area.