Which autofocus points on the Nikon D750 work at f/8?
Asked 4/25/2015
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The Nikon D750 is often described as having 11 autofocus points that support focusing at a maximum effective aperture of f/8. Which AF points are those, and why do some sources mention up to 15 f/8-capable points depending on the lens/teleconverter combination?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
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According to Nikon D750 User’s Manual (rev. 03), there are 11 to 15 autofocus points rated up to f/8. On page 430, the manual details which points work with different lens and teleconverter combinations.
The 15 points that usually work at f/8 comprise the 3×3 square around the center point, a row of 3 points to the right of the square’s middle right point and a row of 3 points to the left of the square’s middle left point.
The 11 points that always work at f/8 are the center point, a row of 4 points to the right of the center point and a row of 4 points to the left of the center point, the point directly above the center point and the point directly below the center point.
The TC-14E series of teleconverters lose about 1 stop of light, the TC-17E II loses about 1.5 stops, and the TC-20E series lose about 2 stops.
Originally by user13944. Source · Licensed CC BY-SA 4.0
user13944
9y ago
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Generated from our catalog & community — verify before relying on it.
On the D750, the f/8-capable AF points are centered around the middle of the AF array.
The 11 points that are consistently available at f/8 are:
- the center point
- 4 points immediately to the left of center
- 4 points immediately to the right of center
- 1 point directly above center
- 1 point directly below center
Some lens and teleconverter combinations allow up to 15 points at f/8 instead of 11. In those cases, the usable area expands to a wider central cluster around the center point. Nikon documents the exact supported points by lens/teleconverter combination in the D750 manual (see the AF compatibility table).
Why this happens: adding a teleconverter reduces the effective maximum aperture. For example, a 1.4× teleconverter costs about 1 stop, a 1.7× about 1.5 stops, and a 2× about 2 stops. Once the effective aperture reaches f/8, autofocus performance is limited to only the points Nikon rates for that light level.
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