A firmware upgrade that refines shooting responses and creative options for the A900 and A850 35mm full-frame DSLR cameras from Sony has been released and all new and existing customers are advised to install the upgrade.

With it autofocus is quicker and more responsive, thanks to improved AF motor control and smarter distance detection of out-of-focus objects.

Creative options are extended by a broadened range of exposure value (EV) compensation settings, now increased from ±3EV to ±5EV.  This boosted EV compensation range gives extra headroom when composing extremely high- or low-key images.

Exposure bracketing range has also been increased from a maximum of 4.0EV (three shots at -2EV, 0EV, +2EV) to a maximum of 6.0EV (-3EV, 0EV, +3EV). This wider range gives added flexibility when capturing multiple frames at different exposure values – for example when acquiring images for the creation of powerful post-shooting HDR effects.

As a further refinement, a new menu option allows shutter release to be enabled, even when the camera body doesn’t detect an attached lens. It’s useful for specialist applications such as astrophotography when the camera is attached to a telescope.

The upgrade by Sony is available free of charge from the support area of the Sony website.