Pentax ES II ES II Manual - Page 18

OPEN-APERTURE OR STOP-DOWN READING With the new SMC Takumar lenses with the diaphragm coupling lever 0, mounted directly on the ES I I camera body, the TTL meter reads exposure through the full-open aperture for correct automatic exposure. For open-aperture reading, the stop-down lever should be DOWN. With all other lenses, or when using Extension Tubes, Bellows Unit or Microscope adapter, remember always to push up the stop- down lever for stopped -down aperture reading and correct 1 automatic exposure. The SMC Takumar 85mm f/1.9 (bottom, left) and SMC TakumarZoom 85mm-210mm lenses do not have the diaphragm coupling lever 0; therefore, they should be used on the ES I I for stop-down reading. CAUTION: All SMC Takumar lenses up to 300mm except the above two are designed for open-aperture reading. When directly mounted on the ES II, they will give correct exposure readings at full aperture. Do not try to take meter readings at stopped-down aperture, as this will indicate different shutter speeds. Also remember that the TTL metering does not work unless the shutter dial is set at "AUTOMATIC". 16