square, format. Note that dual 24×24 mm frames on 135 film were used by the non-SLR David White Stereo Realist (USA, 1947), leader of the 1950s stereo photography fad. 1954 Asahiflex IIB (Japan; called Sears Tower 23 in USA): first SLR with reliable instant return mirror.Lothrop & Schneider. "The SLR Saga (part 2)," pp. 50–51Schneider, "First 35mm SLR made in Japan?" pp. 25, 30 1954 Praktina FX (East Germany): first available spring powered motor drive accessory for SLR, first breech-lock lens mount. 1954 Tokiwa Seiki Firstflex 35 (Japan): first interchangeable lens, leaf shutter 35 mm SLR. Otherwise a wholly forgettable camera; cheaply made to low specifications and of poor quality, with waist level finder. 1955 Miranda T (Japan): first Japanese pentaprism eyelevel viewing 35 mm SLR.Matanle, pp. 171–172 Note that the Tokiwa Seiki Pentaflex (Japan), a modified Firstflex 35 (see above), had an eyelevel viewfinder four months before the Miranda, but using a porroprism. Orion Seiki (company renamed Miranda Camera in 1956) produced a versatile SLR system in the 1960s, called by some "the poor man's Nikon," but was unable to keep up with the rapid advances in electronics of the 1970s and went bankrupt December 1976. 1955 Kilfitt 4 cm f/3.5 Makro-Kilar (West Germany/Liechtenstein): first close focusing "macro" lens for 35 mm SLRs (for Exaktas and others). Version D focused from infinity to 1:1 ratio (life-size) at two inches; version E, to 1:2 ratio (half life-size) at four inches.Stephen Gandy, "1st 35mm SLR MACRO LENS: Kilfitt Makro-Kilar of 1955: infinity to 1:2 or 1:1" retrieved 5 January 2006 Because SLRs do not suffer from parallax error due to the offset between the taking lens and a viewfinder lens, they are far superior for close-up photography than cameras with other optical viewfinder systems (though the viewfinder screens on digital cameras also show the image as seen by the taking lens). Most SLR lens lines continue to include macro lenses optimized for high magnification, although their focal lengths tend to be longer than the original Makro-Kilar to allow more working distance. "Macro zoom" lenses began appearing in the 1970s, but traditionalists object to calling most of them macro because they usually do not focus closer than 1:4 ratio, with relatively poor image quality.Lester Lefkowitz, "Lenses: Facts and Fallacies," pp. 75–98. Modern Photography, Volume 47, Number 9; September 1983. . p. 95 1955 Ihagee Exakta Varex worlds first 35mm SLR with external