Olympus today tackled the absence of a mid-range digital SLR in the E-system lineup with the E-30, a step between the entry-level E-520 and the more professional E-3. The 12.3-megapixel camera has the faster and more accurate 11-point autofocus performance of the higher-end E-3, an electronic level to ensure straight landscape shots and image stabilization built into the sensor rather than just t