Pentax 645 645 Manual - Page 51

PROGRAMMED AUTO FLASH OPERATION • When combined with a Pentax dedicated auto flash (AF400T, AF280T, AF200T or AF200SA), a predetermined f/stop is automatically set, should the aperture ring be set at the "A" position. The completion of flash charging will automatically switch the shutter speed to 1/60 sec. The 4 indication appears in the external LCD window and the viewfinder LED, indicating that the charging has been completed. Aperture set to "A" [Programmed AE, Aperturepriority AE or shutter-priority AE], • Adjust the flash mode selector of the AF200T, AF280T or AF400T, to the auto position (red, green or yellow). • Simultaneously with the completion of the charging, the viewfinder LED display indicates 1/60 sec. According to the auto positions (red, green or yellow), the f/stop automatically varies as shown in the table below. (f/4 with AF200SA with ISO 100 film) AF200T AF280T AF400T Red Green Yellow f/2.8 F/4 f/4 f/5.6 f/8 f/8 - - f/11 (With ISO 100 film) (Example: Should the selector of the AF200T be positioned at the "red" indication (ISO 100 film) the aperture automatically adjusts to f/2.8.) As the film speed changes, the f/stop automatically changes; however, the maximum flash-to-subject distance remains unchanged. Also refer to your flash unit operation manual. Aperture set at a given f/stop [either Aperturepriority AE or Metered manual mode] , • Adjust the selector of the auto flash unit to "AUTO" position (red, green or yellow). • Set the f/stop in accordance with the flash calculation guide found on the flash unit. • With a dedicated auto flash unit, the completion of the charging automatically adjusts the shutter speed to 1/60 sec. (In metered manual mode, flash synch at a slower shutter speed under 1/60 sec. is also possible.) In this case, although you can set the exposure compensation button with the indication shown in the viewfinder, the exposure compensation function, in effect, does not work. 49