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EXCERPT page containing first few paragraphs. 2021-12-01 07:39:16

Nikon D810

Nikon 14-24mm f/2.8G ED

Focus Shift, Dual Series: Lee Vining Canyon, Fresh Snow on Mountains

This dual aperture series at 14mm shows the severe loss of resolution that occurs due to the focus shift of the Nikon 14-24mm f/2.8G ED.

While the 14-24 is a very sharp lens wide open, its performance declines with stopping down, with an obvious loss of sharpness at f/4. And it never recovers the sharpness of f/2.8, even at f/9, due to its pronounced rearward focus shift. Shot with the Nikon D810, this behavior is even more damaging on a Nikon D850.

And yet with proper focusing technique, all that sharpness can be utilized. Accordingly, this page shows two series:

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Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
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Optimal focus sequence is same at f/2.8, but refocused at f/4

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