Pentax K5 / Apple Aperture - White Balance Inconsistency
Used my new Pentax K5 with studio flash for the first time on Saturday. I got some peculiar colour temperature results. Can anyone explain this?
All shots used the following settings:
- Raw DNG
- Adobe RGB
- Camera white balance set to "Flash"
- ISO 100
- 1/180s
- f/11 to f/19
- same lens used throughout ( Pentax A 50mm macro f2.8 )
When I loaded the raw files in to Apple Aperture the colour temperatures of the raw conversions came out as an inconsistent variety of temperatures and tints. As sample, the first ten shots on the "roll" show the following white balance values after raw conversion (prior to any manual adjustments being made):
5759 K / +4
5759 K / +4
5759 K / +4
5759 K / +4
4492 K / -9
4479 K / -7
4463 K/ -8
4469 K / -11
4563 K / -8
4572 K / -8
(For what its worth, 5759 K / +4 looks right to me.)
What is going on? Do I have a camera problem or an Aperture raw conversion problem?
iMac, Mac OS X (10.6.8), Aperture 3.2.2