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Centre Focus on A7R3


W7DRB
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Advice needed on best use/settings - on full zoom using 200-600mm to capture a single, static bird at distance, the center focus area seems too large and will frequently focus on a point around or behind the bird such as branches or reeds etc. leaving the bird unclear. Is there a way to reduce the size of the center focus or should I be using a different setting? Advice appreciated - I'm still very much learning.

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