Hi!
First, some "facts" (E-TTL with type-A body):
- In P mode, the camera chooses shutter and apperture values (whatever it thinks it is
correct). It should expose for the subject, if the light is dim.
- In Tv/Av mode, the camera chooses apperture/shutter speed values according to
ambient light, regardles of flash. This values can be typically very slow or may
blink. (for example, if proper exposure would be 1 sec @ f/2, the apperture value
would blink if one would set the shutter speed to 1/30 in Tv mode).
Question: would the subject be properly exposed in this situation, even though the
apperture value blinks?
Question: If I want to control the background (between P mode and Av mode), meaning
that I am not satisfied with P mode settings nor with Av settings (too slooooow
shutter speed) and set the flash to E-TTL and camera to M mode, where selecting, let
say 1/30 @ f/8 (the exposure meter would indicate a terrible underexposure), will the
subject be properly exposed?
Second curtain sync. We know that with E-ttl, the flash "should" fire preflash to
calculate the correct flash exposure.
If I set the camera to mode Av, and set such apperture value that the shutter speed
will be long enough for me to see whether the flash fires at the second curtain, the
flash fires two times (first curtain or preflash and second curtain) when set to E-TTL
and only on second curtain when set to M.
Question: Is the first one preflash, not seen on the film and the second burst a flash
exposure on the second curtain or is it something else (compatibility issue with body)?
By the way: I'm impressed with Sigma Super 500 and all the functions it has -- I'm
also impressed with possibilites for wireless flash operation.
Kindest regards,
Miha.
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