Pentax ISTDS Operation Manual - Page 51

Using the Built-in Flash 49 Basic Operations Using the Built-in Flash Use the following procedures to take a picture in low light or backlit conditions or when you want to manually use the built-in flash. The built-in flash is optimum at about 0.7 m to 4 m. Exposure will not be properly controlled and vignetting may occur when used at a distance closer than 0.7 m. (This distance varies slightly depending on the lens 3 being used and set sensitivity. (p.149)) Compatibility of built-in flash and lens Vignetting (surrounding portions are blackened due to a lack of light) may occur depending on the lens being used and the capture conditions. We recommend taking a test shot to confirm this. 1DA, D FA , FA J, FA and F Lens Compatibility with the Built-in Flash (p.151) • When using the built-in flash, remove the lens hood before shooting. • The built-in flash fully discharges when pre A lenses are used. B Auto discharge Camera automatically determines surrounding light and built-in flash pops up and discharges automatically when necessary. (Flash does not discharge even if it is popped up when not necessary.) b Manual discharge Discharges flash manually. Flash discharges when popped up, does not discharge when retracted. C Auto flash+Redeye reduct Light a red-eye reduction light before automatic flash. D Manl flash+Redeye reduct Discharges flash manually. Light a red-eye reduction light before manual flash. • In a Flash OFF mode, flash does not discharge even if settings are changed. The set Flash mode is retained. • Manual discharge mode (Flash ON) is used regardless of flash mode settings if the K button is pressed to pop up the flash manually.