Sony has released a free firmware update designed to boost the performance and operability of its Alpha 77 and Alpha 65 SLT cameras.

The company claims: ?Autofocus accuracy is now improved when focusing on scenes with wide contrast difference between objects.?

Sony says it has also improved the AF speed when using both cameras with the recently-announced 500mm f/4 telephoto.

And the firmware is also designed to correct vignetting, lateral aberration and distortion for six further A-mount lenses.

Firmware version 1.05 aims to improve the cameras’ responsiveness when using auto review mode, for example.

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