Leicaflex SL
In 1968 the Leicaflex SL was introduced, with the SL standing for selective light. The Leicaflex SL featured TTL metering with a 5% selective measurement of the subject field, corresponding with the diameter of the circle of the micro prism. This meant that the Leicaflex SL was the first SLR camera with selective TTL metering. This was considered theoretically superior to other systems that relied on the average reading of the whole prism. This model also featured a depth-of-field preview button. There were a few cosmetic revisions including the change of the colour of the shutter dial from silver to black and the relocation of the batteries to the camera's base plate. Models were produced in silver chrome and black paint. In 1972 a special edition was produced to commemorate the 1972 Summer Olympics, held in Munich, West Germany. The Olympic rings and the number 72 were engraved on the top plate, only 1,200 of these were produced with special serial numbers.
From 1972 to 1974 a small number of Leicaflex SL MOT were produced in black, and a few in silver chrome, with 'MOT' engraved on the top plate. These models have an internal drive shaft, which allowed an external motor to be attached for fast film winding. Furthermore all contacts and controls were mounted externally on its base plate, thus allowing for quick mounting of the motor without the need to remove the base plate. The SL MOT, however lacked the self-timer and the meter switch in the advance lever of the ordinary models.
