The DP-1 had a center-the-needle exposure control system using a galvanometer needle pointer moving between horizontally arranged + / over / underexposure markers at the bottom of the viewfinder to indicate the readings of the built-in 60 / 40 percent centerweighted, cadmium sulfide ( CdS ) light meter versus the photographer's actual camera selections.
12.
The " Standard Output Sensitivity " ( SOS ) technique, also new in the 2006 version of the standard, effectively specifies that the average level in the sRGB image must be 18 % gray plus or minus 1 / 3 stop when the exposure is controlled by an automatic exposure control system calibrated per ISO 2721 and set to the EI with no exposure compensation.
