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Nikon NIKKOR Z 20mm f/1.8 S

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Astrophotography at f/2

For astrophotography, wider is often better, and 20mm is a key focal length.

This page looks at the f/2 performance of the Nikon NIKKOR Z 20mm f/1.8 S on an 11-minute exposure. Aperture f/2 was chosen over f/1.8 to provide more uniform illumination over the frame, and slightly better sharpness.

The image quality from the Nikon Z7 in this image is so awful that I deem it unusable for astrophotography—see the crop that follows.

Astrophotography at f/2

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f2 @ 659.0 sec LENR enabled, ISO 64; 2020-08-13 21:42:55
NIKON Z7 + Nikon NIKKOR Z 20mm f/1.8 S
ENV: White Mountains, altitude 10500 ft / 3200 m, 60°F / 15°C
RAW: LACA corrected, distortion corrected

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