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Sony has issued firmware updates for its 35mm full-frame primes which claim to improve focus point reliability when using manual focus for long periods of time. The new firmware is offered for the FE 35mm F1.4 ZA and FE 35mm F2.8 ZA Zeiss-branded lenses.
Download firmware 2.00 for the Sony Distagon T* FE 35mm F1.4 ZA
Download firmware 2.00 for the Sony FE 35mm F2.8 ZA Carl Zeiss Sonnar T*
Articles: Digital Photography Review (dpreview.com)