For more enjoying your A900 and A850 DLSR camera, Sony released the upgrade of their firmware. With the latest firmware, your cameras will have a quicker and more responsive Autofocus, boosted EV compensation range from ±3EV to ±5EV, increased a maximum EV range from 4.0EV to 6.0EV, and a new menu which allows shutter release enable even when the camera body doesn’t detect an attached lens.