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Speedlight flashes can shoot in two different modes: TTL flash or manual. So what's the difference and which flash mode is better? Read all here! You should also consider whether the flash is ETTL (i-TTL) compatible or just manual. Cheaper wireless systems usually are not compatible with your camera's ETTL:Fully Automatic Wireless Flash Shooting . . . . . 9-13 Speedlites that have a wireless multiple flash shooting function using radio transmission.In a nutshell, TTL is the way that the camera sets the exposure and flash intensity automatically by firing a nearly imperceptible pre-flash, taking an exposure eTTL is automatic, and works with at least a partial-auto setting. If you have reason to set your camera to a full-auto or partial-auto mode, then go ahead and My general practice is to use TTL when the flash is attached to the camera, including on a flash bracket. But when the flash is on a stationary There are TTL flashes, A-TTL (automatic-TTL), and E-TTL (evaluative-TTL flashes). Each type works off the same principle but functions differently.