Wed 24-Oct-12 06:03 AM | edited Wed 24-Oct-12 06:05 AM by Lighter
Let's put it in this way- Lo ISO values are not native to the sensor. The sensor of D90 is made to work at ISO 200 at the least. The three reduced values offered Lo0.3, Lo0.7 and Lo1.0 are basically created by the Firmware of D90. A rough analogy of this feature can be drawn with the Optical Zoom and Digital Zoom feature offered by some Point n' shoot cameras. Imho, it's better to use the camera at it's native ISO values unless one is compelled otherwise. Lo ISO values should be avoided as Hi ISO values. I tried Lo ISO values and compared the same scene photographed with ISO 200, and found that ISO 200 offered much better result.