Unknown. Help us by suggesting a value. (Sony SLT-A55)
Unknown. Help us by suggesting a value. (Sony SLT-A58 + Sony DT 18-55mm)
With a higher light sensitivity (ISO level), the sensor absorbs more light. This can be used to capture moving objects using a fast shutter speed, or to take images in low light without using a flash.
Maximum ISO: is this important to you?