After introducing a slew of mirrorless cameras recently, Sony returned to DSLRs this month with the Alpha a77 II. This $1,200 cameras headline feature is the ability to shoot 12 photos per second, for up to five seconds — making it one of the fastest DSLRs available. Key to that speed is a rapid autofocus (AF) system based on Sonys translucent mirror version of DSLR technology. Meanwhile, Canon introduced last summer its $1,999 EOS 70D camera with an AF innovation called dual pixel to lock focus on video subjects.
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