My Mouse (3pics) Original: Camera: Pentax K-r ISO: 6400 Exposure Time: 1/15 F-stop: f/5.6 Changing the Brightness (Exposure Bias from 0 to -1.7): Camera: Pentax K-r ISO: 3200 Exposure Time: 1/25 Exposure Bias: -1.7 F-stop: f/5.6