Originally posted by buaobao Can the K-5 new fw v1.02 really expose correctly(using external flash) without changing aperture, sensor ISO or shutter speed if using bounce flash at the colored ceiling or not so bright wall, or maybe a ceiling that is 8 meters high and a wall that is another ten meters away like a ballroom size ? (just a thought)
The concept of P-TTL is that a split second before the actual exposure, it sends out a "pre-flash" that lets the camera know how the flash will behave in the environment. Because the camera has already "seen" what the flash does with the ceiling/walls beforehand, it then adjusts the power of the second flash accordingly for the actual exposure.
The only thing that changes is the flash power. All the other camera settings remain the same (except perhaps AWB). The problem with the K-5's bounce flash bug is that it is firing the flash at a much higher power than it should.
Anyway, I found the bounce flash overexposure problem very early on, and was disappointed that 1.01 didn't fix it. I would test 1.02, but my camera is currently off at Pentax for replacement, so I can't. Oh well, it's good news if they really do fix it (and hopefully my new camera won't have the problem).