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EXCERPT page containing first few paragraphs. 2022-08-17 01:32:04

Focus Shift with the Nikon 14-24mm f/2.8G (Early Tests)

In central areas, the Nikon 14-24 declines in sharpness when stopped down from f/2.8 to f/5.6.

While shooting some field comparisons in summer 2010, I observed that the Nikon 14-24mm f/2.8G declined substantially in contrast from f/2.8 to f/5.6 (see the bristlecone comparison and the road comparison in DAP). I had previously observed this effect, but it hadn’t occurred to me that this could be focus shift, because that’s rare with an f/2.8 lens.

Focus shift to the rear

The Nikon 14-24 is optimized for wide open central sharpness and it offers high contrast without the usual haze. But the compromise was focus shift when stopping down.

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Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.

Variants 2_8, 5_6 available in full article
Crop at center at f/2.8, mouse over for f/5.6

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