33TTL auto flash mode● ● ● TTL auto flash mode: DIn this mode, the flash illumination that is reflected back from the subject isdetected by the camera's TTL auto flash sensor and the camera automaticallycontrols the flash output level to give the correct exposure.Automatic Balanced Fill-Flash: DoPress the a button to display Do on the LCD panel, and AutomaticBalanced Fill-Flash is performed. The flash output level is automaticallyadjusted for a well-balanced exposure of the main subject and background.When performing Balanced Fill-Flash, however, no o appears with cameras inGroups III and IV.• Do indicates “i-TTL Automatic Balanced Fill-Flash” in the i-TTL mode.Standard TTL flash: DPress the a button to display D on the LCD panel, and Standard TTLflash is performed. The main subject is correctly exposed regardless of thebackground brightness. This is useful when you want to highlight the mainsubject.• D indicates “Standard i-TTL flash” in the i-TTL mode, “Standard TTL flash for DigitalSLRs” in the D-TTL mode, and “Standard TTL flash” in the TTL (film-based) mode.t Notes on TTL mode indicatorsComparison tables are provided on page 78 to show the SB-600's TTL modeindicators and the corresponding ones used in the current Speedlightinstruction manuals.• For details on shooting procedures in the TTL auto flash mode, refer to “Basic operation”(p. 17).Detailed operationAll manuals and user guides at all-guides.com