optic. Shortly after being launched the camera was renamed the OM-1 to avoid a trademark conflict with Leica. The mechanical, manual OM-1 was significantly smaller and lighter than contemporary SLRs, but no less functional. The camera was supported by one of the most comprehensive 35 mm SLR lens and accessory systems available. Maitani decreased the size and weight by totally redesigning the SLR from the ground up with unprecedented use of metallurgy, which included repositioning the shutter speed selector to the front of the lens mount, instead of a more conventional position on top of the body. 'Off-the-film' electronic flash metering Olympus – the OM-2 Olympus made another significant advance with the OM-2 in 1975, featuring aperture-priority automatic exposure with the world's first off-the-film plane available-light metering and off-the-film (which Olympus referred to as 'OTF') flash metering systems. By metering light in real time off the film plane the OM-2 was able to adjust exposure if light levels changed during exposure. By eliminating flash metering via a built-in photocell on a flash unit the OTF system was able to meter more accurately, and also significantly simplify multi-flash shooting as it was no longer necessary to calculate and factor-in exposure for multiple light sources. This system was especially valuable in photomacrography (macrophotography) and photomicrography (microphotography). The Olympus OM System was further enlarged; its Zuiko lenses gained a reputation as being among the sharpest lenses in the world, and in the 1980's, Olympus added further improvements by replacing the OM-1 and OM-2 cameras with the OM-3, a mechanical manual SLR and the OM-4 automatic, both of which featured multi-spot metering capabilities. These cameras were further improved into the last of the OM SLRs, the titanium-bodied OM-3Ti and OM-4Ti, introducing at the same time, the world's fastest electronic flash synchronization speeds, at 1/2000 second with their new Full-Synchro strobe-based flash technology. Gradually, other manufacturers incorporated this feature into their own SLR camera designs. Programmed autoexposure By 1974, the autoexposure SLR brands had aligned into two camps (shutter-priority: Canon, Konica, Miranda, Petri, Ricoh and Topcon; aperture-priority: Asahi Pentax, Chinon, Cosina, Fujica, Minolta, Nikkormat and Yashica) supposedly based on the superiority of their chosen mode. (In reality, based on the limitations of the electronics of the time and the ease of adapting each brand's older mechanical designs to automation.) These AE SLRs were only semi-automatic. With shutter-priority control, the camera would set the lens aperture