Originally posted by fuf How did you test? Which settings, what lenses? I found out that with the older firmware the over/underexposures greatly depended on the lens used: overexporuse with FA31, FA77, bad underexposure with DA15, DA21.
With FA31, aperture set to 2.0, P-TTL with 540 with 90 bounce, ISO 200, Av mode and subject (a person) cca. 2m away I'm getting overexporuse with firmware 1.12. When I tested in an empty room the exposure was okayish.
I have made successfull tests with 3 lenses : DA 35mm F2,4, DA 70mm F2,4 Limited and Sigma 17-70mm F2,8-4,5
Exposure parameters : multi-segment metering, Mode M, 1/180s, F5,6, ISO 100
1. I determine the minimum distance of the subject with direct flash (range displayed on LCD). It's about 3m.
2. I put the subject at 4m beyond the minimum distance (all the objects before the minimum distance will be normally overexposed).
3. I take three photos, one with direct flash, the other with flash bounced toward the ceiling and another toward a wall (white wall and ceiling)
Prior the v1.12 firmware upgrade i had to reduce flash power with bounce flash. Now it's good. No overexosure with bounce flash. I observe an attenuation of the brightness with bounce flash when i compare to direct flash.
It seems like the K5 P-TTL was asking full power to the bounced flash prior the v1.12 firmware. Now power flash seems to be the same level for bounce and direct flash.
For your case i think overexposure of the subject at 2m is not anormal with the K5 because it is before the minimal flash distance range. Perhaps the K20D had a better result at 2m because its trend to preserve hilights. (prior the K5 i had a K20D)
Last edited by pscl57; 01-14-2012 at 03:17 AM.