What looks like a minor upgrade to Sonys current consumer mirrorless cameras could have just the right new features to attract DSLR shooters. On the outside, Sonys new Alpha a6000 mirrorless camera is nearly indistinguishable from its predecessors, the NEX-6 and NEX-7. But the combination of a faster autofocusing technology and a relatively low price ($800, with lens) — could make the 20.3-megapixel camera enticing to DSLR users when it goes on sale in April.