Posts Tagged ‘autofocus’


How many AF points are ideal for photos of birds in flight?

 •  November 25

My Nikon D7200 has several autofocus options, including 1 AF point, 9 AF points and 51 AF points. Which of these do you recommend for birds in...

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What’s the best way to calibrate a lens for autofocus accuracy?

 •  December 19

A friend sent me a link to an article on the Internet about the need to calibrate lenses so they will autofocus with 100% accuracy? But if this is so...

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Will a small maximum aperture of f/6.3 at the 400-mm and longer zoom settings cause a problem for autofocus?

 •  January 31

I noticed that many telephoto zooms, including the Tamron 150-600 mm and the Sigma 150-500 mm, feature a small maximum aperture of f/6.3 at the...

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