in 1963 (see above), the various SLR manufacturers tried many different sensitivity schemes (full area averaging, centerweighted, partial area and spot were the most common) in the 1960s before settling in the mid-1970s on centerweighted as the best (90% acceptable exposures) available system. AMP cut the error rate by half. Matrix meters became virtually standard in 35 mm SLRs by 1990 and modern ones are virtually 100% technically accurate. Note however, the technically correct "18% gray" exposure is not necessarily the artistically desirable exposure.Goldberg, Camera Technology. p. 51Shull, p. 48 In 1996, the number of computer analyzed segments reached a maximum of 1005 in the Nikon F5 (Japan). 1983 Olympus OM-4 (Japan): first camera with built-in multiple spot-meter (2% of view; 3.3° with 50mm lens). Meter could measure eight individual spots and average them for precise exposure control in difficult lighting situations."Modern Tests: Olympus OM-4 Has Multiple Spot, LCD Panel Metering," pp. 78–86. Modern Photography, Volume 48, Number 5; May 1984. Y. Maitani, and K. Tsunefuuji, "Modern's Inside Your Camera Series #35: Olympus OM-4," pp. 78–79, 136, 138, 142. Modern Photography, Volume 48, Number 9; September 1984. Spotmeters versus matrix meters represent the opposite ends of the light meter spectrum: fully manual contemplative metering versus completely computerized instantaneous metering."Too Hot to Handle," p. 63. Modern Photography, Volume 48, Number 5; May 1984. 1985 Minolta Alpha 7000 (Japan; called Maxxum 7000 in USA, 7000 AF in Europe): first commercially successful autofocus 35 mm SLR, first passive phase comparison AF SLR, first system AF SLR, first SLR with completely automated film handling (auto-load/wind/rewind/speed setting). Well-integrated PASM autoexposure and built-in motor winder design with very good interchangeable lenses and large accessory system."Annual Guide '86: Modern Photography's 48 Top Cameras: Minolta Maxxum 7000," p. 46. Modern Photography, Volume 49, Number 12; December 1985. Herbert Keppler, "Keppler’s SLR Notebook: Minolta's Incredible MAXXUM 7000 SLR," pp. 16–17, 110, 112, 116, 118, 124, 98. Modern Photography, Volume 49, Number 3; March 1985. Schneider, "The Top 20 Cameras of All-Time," July 2008, pp. 148, 150 Ever since the first autofocus camera, the non-SLR Konica C35 AF 35 mm P/S of 1977 (with its built-in passive electronic rangefinder system),"Modern Tests: Konica C35AF: First Auto-Focus Still Camera," pp. 136–139. Modern Photography, Volume 43, Number 4; April 1979. Jason Schneider, "The Top 20 Cameras of All-Time," July 2008, pp. 146, 148Wade, Classic Cameras. pp. 163–165 AF had been common in 35