![]() ![]() The Double Cable Release allows the automatic iris diaphragm mechanism in a lens to operate when the lens is mounted on the bellows, in the normal position or reversed. The later version, introduced in 1980, retains the white marks for 50mm lenses and the orange marks for the manual Zuiko 1:1 Macro 80mm f/4 lens, and additionally has green 1× and 1.5× marks for the Zuiko Auto-1:1 Macro 80mm f/4 lens. The original version, introduced in 1972, includes white 1× and 1.5× marks for 50mm lenses and orange 1× and 1.5× marks for the manual Zuiko 1:1 Macro 80mm f/4 lens in conjunction with the Slide Copier. Photograph courtesy of Peter and Ingrid Oerlemans ( There are 2 versions of the rail. The “ OM SYSTEM” logo is on the rear standard, just below the lens mount. The Auto Bellows was one of the very first accessories, and some boxes and bellows were made with the original “ M SYSTEM” designation that was replaced in January 1973 by the familiar “ OM SYSTEM” designation. * These values are approximate minor differences in the manufacture of the front standard, rear standard and bellows over the years cause variation of 1–2 mm. With the Zuiko Auto Macro 135mm f/4.5 lens, which was introduced several years later, the focusing range is from infinity to ×1. The Auto Bellows when used with the 3 original bellows macro lenses permits magnifications from ×0.5 with the Zuiko 1:1 Macro 80mm f/4 lens up to ×12.3 with the Zuiko Macro 20mm f/3.5 lens. The Focusing Rail was also available separately.Īnother unusual feature is the ability to remove the lens mount and reverse it, allowing the 50mm standard lenses to be reversed for improved performance, with the bellows clamped to the front of the lens instead of to the rear of the lens mount. The 50mm markings are white, the 80mm markings are orange, and the 80mm auto markings (only present on later versions) are green. The top surface also has 1× and 1.5× marks for 50mm and 80mm lenses when used with the slide copier. There are marks at 5mm intervals, and the 50, 100, 150 and 200mm positions are labelled. The top surface of the focusing rail has an extension scale with white markings on a black background. The mount can be removed, to make it easier to attach the camera body. The camera mount can be rotated through more than 180°, and is locked in place with a knob at one side. The clamping knob can be used to adjust the friction as well as to lock the boards and block in place. The boards and the block have a focusing knob on on side, and a clamping knob on the other. The focusing tripod block is moved with a rack and pinion on the lower surface of the focusing rail. The lens mount board and the camera body mount board are moved with a rack and pinion on the top surface of the focusing rail. The rail can be reversed, allowing the extension to be measured from either the front or the rear. This is particularly important with the high magnifications (and short lens-to-subject distances) that are possible with the 20mm and 38mm bellows macro lenses. This allows the lens mount to be positioned at the end of the rail, so that the rail does not protrude towards the subject. The Olympus bellows unit differs from those of most other 35mm systems because the camera body mount board, not just the lens mount board, can be moved along the rail.
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