corresponding to the degree of accuracy should only be taken as far as necessary accordingly it is advisable to use as standard measurement the accuracy with which the film sensitivity is indicated this is only accurately indicated at 1 u00b0 din german industrial standard corresponding to 1 3 light value as var as the exposure time is concerned this means that between two stages of the exposure times t e it must be possible to have two intermediate values namely t e1 2 1 3 and t e1 2 2 3 for example according to din german industrial standard 19016 the next value is then either t e2 or 2 t e1 hence the binary stages 3 6 here indicate the time t e and the binary states 1 and 2 indicate whether this value is to be multiplied by 2 0 2 1 3 or 2 2 3 similarly a logical correlation of the shutter times and the state of the binary stages after these have reached their storing stage is produced in this 34 h 34 means that there is a zero potential at the upper output of the binary stages and 34 l 34 means that there is a positive potential ca 3v at.