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<blockquote data-quote="hark" data-source="post: 751700" data-attributes="member: 13196">Steve Perry from Backcountry Gallery has a video that explains some of the differences. Here is the link to his article, and at the end I will post the video from that article. <a href="https://backcountrygallery.com/understanding-nikon-af-modes/" target="_blank">https://backcountrygallery.com/understanding-nikon-af-modes/</a>There is something important to remember. The Nikon 51-point AF system is designed to fully work with lenses that are f/5.6 or faster. If you are using a Sigma or Tamron variable aperture zoom such as the Sigma 150-600mm f/5-6.3 DG OS HSM lens where the lens is zoomed out to the tele end, the largest aperture you can use is f/6.3 when shot wide open. That throws a caveat into the equation. To simplify - you will no longer have all 51 points available to you.If you advance the video to 1:30, that's where Steve shows examples of 51 points vs. 11. I can't remember if he mentions not being able to use all the points with lenses that are slower than f/5.6 though. [MEDIA=youtube]_N_bzhJAKms[/MEDIA]</blockquote>

[QUOTE="hark, post: 751700, member: 13196"] Steve Perry from Backcountry Gallery has a video that explains some of the differences. Here is the link to his article, and at the end I will post the video from that article. [URL]https://backcountrygallery.com/understanding-nikon-af-modes/[/URL] There is something important to remember. The Nikon 51-point AF system is designed to fully work with lenses that are f/5.6 or faster. If you are using a Sigma or Tamron variable aperture zoom such as the Sigma 150-600mm f/5-6.3 DG OS HSM lens where the lens is zoomed out to the tele end, the largest aperture you can use is f/6.3 when shot wide open. That throws a caveat into the equation. To simplify - you will no longer have all 51 points available to you. If you advance the video to 1:30, that's where Steve shows examples of 51 points vs. 11. I can't remember if he mentions not being able to use all the points with lenses that are slower than f/5.6 though. [MEDIA=youtube]_N_bzhJAKms[/MEDIA] [/QUOTE]

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