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EXCERPT page containing first few paragraphs. 2022-10-05 15:01:32

Effect of Shutter Type on Bokeh vs Shutter Speed and Aperture

EFC shutter mangles bokeh at wider apertures and 1/2000 second and faster. At its worst, the differences are so great that the bokeh looks like a different lens. Intermediate speeds such as 1/1250 and 1/1600 may show minor effects*. Mitigation tips are included.

This page takes a thorough look how bokeh changes depending on aperture, shutter speed, and type of shutter:

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

Clipped bokeh shapes (right) from electronic first curtain shutter
f1.4 @ 1/8000 sec, ISO 100; 2020-09-24 11:28:08
Sony A7R IV + Sigma FE 85mm f/1.4 DG DN Art
RAW: LACA corrected, push 2 stops, +10 Whites, +15 Clarity, Luminance NR {20,,50,0}, Chroma NR {20,50,50}

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