I don't use a 1n, but it sounds like using a large aperture will cause the
shutter to exceed the flash sync speed. If this is happening when the ambient
light is very low, then I'm obviously was off base with this explanation.
Geoff Doane
Tim Williams wrote:
> In program (P) mode I find that the program is not shiftable when the flash
> is turned on. It is usually at F4.0 Of course A-TTL will stop it down for
> close subjects and sometimes for reasons unknown to me I will see that 3.2
> aperature may be chosen automaticly.
>
> If I set the camera to Manual (M) mode and 2.8 at 1/60th or 1/90th (or
> 1/200th for that matter) will the TTL system function to still give the
> right amount of light from the flash?
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