There’s a new twist on the “EVIL” (Electronic Viewfinder Interchangeable Lens) camera strategy. Yesterday, Sony announced two “SLT” (Single Lens Transparent) cameras, the 16.2-megapixel Alpha SLT-A55 and 14.2-megapixel Alpha SLT-A33. Both cameras use “Translucent Mirror Technology,” which I think is what we used to call a pellicle mirror. Like Sony’s recent NEX cameras and the Olympus and Panasonic Micro Four Thirds cameras, the new Sony Alpha SLT-A55 and SLT-A33 have an electronic viewfinder instead of the traditional SLR TTL optical viewfinder. Where they differ from the NEX and Micro Four Thirds cameras is the transparent mirror between the lens and sensor. The mirror allows Sony to use phase-detect auto focus in the SLT cameras instead of the less accurate contrast-detect auto focus used in video DSLRs and other EVIL cameras. That means the new Sony SLT cameras should have much better continuous auto focus in movie mode than any current digital SLR or EVIL camera. Sony also included a new 15-point auto focus system and the A55 is capable of 10-frames-per-second, making it the fastest camera for under $1000 as well as the fastest camera with an APS-C sensor.