Hello,
I just received my new flash: a Sigma EF 530 DG Super for my K100DS. The user's manual of the flash is pretty basic.
Anyway, I started practicing with it and I noticed that the pictures taken with the pTTL mode were dark. So I did some experimenting with manual flash control and it works fine.
I took about 30 pictures at different settings and logged them: Straight, diffused, bounced etc. It seems that in order to take a decent exposure, I need to overexpose by 2 full stops!
The brightness histograms confirm this.
Here are some examples:
For these 3 shots the settings were: RAW, 1/60 shutter speed, f5.6, pTTL mode, 85mm(55mm) focal lenght, no diffuser, no bounce angle, ISO-200, about 8 feet from the subject
no exp compensation
+1 exp comp in the camera
+2 exp comp in the camera
Am I doing something wrong? There are some settings in the flash I don't recognize and not mentioned in the manual. Like C0 C1 C2, SL etc.
Can someone shed some "light" on this subject?
Thanks,
Ismael