Originally posted by FlannelSpoon I have a ZX-5n and a SuperProgram and know that they both support TTL flash. However the manuals do not explain how TTL really works. I did a search and found nothing on the issue.
-If I buy an AF500FTZ will it do TTL on the SuperProgram?
-Does the camera need to be in Program Auto to use TTL?
-Will the pop-up flash on the ZX automatically adjust to lighting in M or Av modes?
-In TTL mode will the camera meter for flash or do you just select an aperture?
TTL works through a light sensor aimed towards the film. At the start of the exposure, the film is revealed (first shutter moves away), then the flash is triggered.
This sensor monitors the amount of light reflected by the film, and the camera shut the flash off whenthe desired amount is reached.
The AF500FTZ will work on any TTL body, fr the SuperProgram to the *istDS2.
TTL flash is operating in every camera modes, so it will work in M, Program, AV, whatever. So, yes, the Pop-up flash of a ZX will work in TTL in any mode.
How the camera meters the ambient with flash on depends on your camera. It usually varies from one mode to another (Tv, Av, etc), and then you can choose 2nd curtain too, which will often force the camera to try to meter for the ambient first.