Here is some sample footage from the other day feeding Layla. Notice in particular how the focus tracks. For reference the Sony a55 is on a tri-pod with the Sigma 30mm f/1.4 EX DC Lens @ f/1.4. The camera is auto focusing on it’s own during this entire clip.
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Sony A-Mount 70-400mm f/4-5.6 G II SSM Lens Review using Sony A99 II
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Tamron SP 70-200mm f/2.8 Di USD Zoom Lens Review – Sony A-Mount
Sony 70-300mm f/4.5-5.6 SSM G II Lens Review – Using A7II
Sony A7r II Review – Real World and w/ Canon and Sigma Lenses!