Sony fired its opening salvo in mirrorless interchangeable lens cameras by launching the Alpha NEX-3 and NEX-5. Elaborating on an early reveal, Sony sees both as trumping Micro Four Thirds cameras through their sensors. Either has a 14.2-megapixel CMOS sensor that reaches APS-C size; the dimensions match those of most DSLRs and are about 60 percent larger than with the MFT system, cutting back on noise while allowing sensitivity as high as ISO 12,800.
