I use a Canon PowerShot S100. My question is, why did I get this (for me) unexpected overexposure?
I was photo-documenting a project and wanted a close up with a good depth of field so I set
- Av mode f7.1
- auto ISO
- Compulsory flash mode
- Focus type - Macro/Close-Up
And got an overexposed result, the first picture.
Then I only changed Exposure mode from "Av" to "Program" and got a more reasonable exposure. Both pictures here are converted from CR2 to jpg without any enhancements in PhotoShop.
I compared EXIF data for the two exposures and found these differences and commons.
P Av Easy shooting mode - Manual Manual ISO Value - Auto Auto Focus type - Close-Up Close-Up Flash bias - 0 EV 0 EV Auto ISO - 200 400 Base ISO - 200 200 FNumber - 2.00 7.10 ISOSpeedRatings - 640 1600 ExposureTime - 1/60 1/60 Exposure mode - Program Av-priority ApertureValue - F 2.00 7.10 ExposureBiasValue - 0.00 0.00