the shutter speed. OM-2000 An Olympus model made by Cosina, the OM-2000 was not considered by Olympus 'die-hard fans' to be a 'true OM' camera. The OM-2000 had a mechanical, vertical-running shutter in contrast to the traditional OM cameras with their horizontal-running shutter. This allowed the OM-2000 to synchronize an electronic flash at 1/125s. Many photographers found this capability an advantage for the use of "fill flash" in daylight. Prototype cameras OM-X During development, the Olympus design team led by Yoshihisa Maitani worked on a completely modular set of units called the MDN (Maitani-Darkbox-Normal), which resembled a 35 mm Hasselblad. This camera was built as a prototype, and is sometimes referred to as the OM-X. A more conventional camera which integrated the shutter, film transport, mirror and viewfinder was called the MDS (Maitani-Darkbox-Simple). The MDS developed into what became the OM-1. Lenses The OM Series lenses had the aperture control ring located at the front of the lens barrel. This was done to move it away from the shutter speed control, which was a ring on the camera body concentric with the lens mount. OM lenses also featured a depth-of-field preview button on the lens, in contrast to most other SLR camera systems, in which the button was placed on the camera body. The OM lens was designed to sit 46 mm (measured from the lens mounting ring, or flange) from the film plane. The combination of on-lens aperture control and the generous 'flange focal distance' make OM lenses adaptable (with limited functionality) to a variety of other camera systems – including Canon EOS models – by using a mount-specific adapter. Prototype lenses Manual Zuiko lenses that were never marketed: 18 mm/f3.5, prototype of 18 mm/f3.5, L.zuiko with 12 elements 10 group, fixed 72 mm thread 50 mm/f2 pancake, prototype of 40 mm/f2 pancake 85 mm/f1.4, prototype, with GRIN (GRadient INdex of Refraction) elements 160 mm/f3.5, prototype 300 mm/f6.3, prototype 400 mm/f4.5, prototype 500 mm/f5.6, prototype 800 mm/f9, prototype 1200 mm/f14, prototype 24–40 mm/f4, prototype 90–250 mm prototype of 85–250/5 Accessories Being a system, Olympus made numerous accessories for professional portrait, photo journalism, sport photography and scientific photography. motor drives and exchangeable camera back for 250 exposures lighting: dedicated flashes, shoes, cords, connectors, power sources, adapters and filters interchangeable focusing screens instead of bulkier exchangeable finders macrophotography: extension tubes, stands & bases, lightings and accessories microphotography: systems and connecting, focusing,