Originally posted by Lage If this was the issue, why is the direct flash pic correctly exposed then? Seems to me that some of you guys are trying to dig up any strange explanation rather than admit that this is a fault that pentax seems incompetent to fix.
Lage, you're absolutely 100% correct, of course.
I agree with Qwntm to some extent -- yes, ISO400 and f/4.5 at 4 feet does have the potential to blow out when flash is used, UNLESS the flash power is controlled appropriately. That's why it's a good test.
And when direct flash is used, it works fine. When wireless flash is used, it works fine.
I don't buy the argument about the indirect bounce flash trying to light up the rest of the room. That doesn't make any sense. The way P-TTL is SUPPOSED to work, a preflash gets sent out, and the camera meters the scene twice to figure out how much the preflash affected the actual in-frame scene by calculating the difference between the ambient light exposure and the preflash-lit exposure.
The flash power is then adjusted to bring the predicted exposure up to a well-exposed scene, when factoring in ambient plus flash. P-TTL doesn't care about the rest of the room, only what the lens sees.
And it's failing in this use scenario.