litefoot@xxxxxxxxxxxxxxx writes:
<< If I am to combine for example one T series flash (say a T 32) mounted on
the camera and another T series on a remote slave as fill in light source
(the type that fires by optical sensor), will the TTL function on an OM 2n
work properly. Will it be able to get proper exposure due to its TTL
function?
>>
Clemente,
this does not work properly since the remote unit does not get
switched off by the camera when it has recieved enough light, but you can do
something very similar with better control of results:
Set the remote triggered fill flash to use Auto (with it's own sensor), set
the aperture on the camera slightly smaller than suggested on the remote
flash's Auto setting. The flash on the OM then is set to use TTL auto flash
but with a small -ve compensation. It sounds complicated but if you
realise you most often want to underexpose a little bit on both the remote
flash and the TTL flash so the result comes out about right.
You can also fine tune foreground/background with the compensation dial
and/or aperture,knowing where the fill flash is relative to your camera.
This works really well to overcome the issue of macro flash if you don't want
a dark background. Put a diffuser on the TTL flash to extend it's duration a
bit, and place the remote flash to one side so it does NOT illuminate the
foreground main subject.
Ideally the TTL flash should be a slower long duration flash with the
remote flash a faster shorter duration to work the best and be included in
the TTL measurement and thus not require compensation.
For a macro setup a better method yet is to trigger both flashes directly
with a cord but use the fill flash with it's own sensor on Auto for the
background and the other flash on TTL for foreground, with a diffuser. This
makes both flashes start together so the TTL flash includes most of the fill
flashes light in it's measurement and thus needs little or no compensation.
I have used this also with two flashes on camera one for bounce fill pointed
backwards/roofwards but it's sensor pointing toward subject and the other
(usually with diffuser) operated TTL. (use a smaller aperture than the Auto
flash aperture setting)
This general technique allows a non dedicated Auto flash to be combined under
TTL control with a dedicated flash albeit with some loss of flexibility in
aperture choice etc.
Regards,
Tim Hughes
>>Hi100@xxxxxxx<<
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