Sharpness test I – Long focus distance
Nikon Z 70-200mm 2.8
At 70mm, f/2.8 is already razor sharp. Diffraction starts from f/11 and increases at f16. Corners are good at 2.8 and excellent at f/4.
At 85mm, f/2.8 is a bit soft but at f/4 the quality is back on track. Corners look good already from the fastest aperture. Once again diffraction becomes noticeable from f/11.
At 105mm, the lens peaks at 2.8. The corners are good wide open but they become perfect at 5.6. Diffraction is more severe from f16.
At 135mm the performance is the same as 105mm.
At 200mm, the same performance continues but the corners look even better from 2.8.
Nikon Z 70-200mm 2.8 + TC 1.4x
With TC 1.4, there is almost no loss in sharpness, as you can see from the results below.
Sharpness test III – Minimum focus distance
At the minimum focus distance (0.5m at 70mm and 1m at 200mm), the performance remains at the highest level. It’s very sharp at 2.8 and the lens already peaks at f4.
The teleconverter behaves in the same way here too.
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