Uploaded June 2017 | Updated September 2026, 2 weeks ago

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Is the A7RII ISO Invariant? Let's find out.

This is Part II, Part I will be the theory. youtu.be/8aogNYnKTPs

A7RII, 35mm 2.8 Zeiss. Uncompressed raw.

Photo 1: 1/60, f5.6, ISO 640, ISO 6400. Increased by 3.33 in Lightroom.

Photo 2: 1/400, f4.0, ISO 100, ISO 500. Increased by 2.33 in Lightroom.

Photo 3: 1/250, f4.0, ISO 100, ISO 500. Increased by 2.33 in Lightroom.

Photo 4: 1/40, f8, ISO 640, ISO 6400. Increased by 3.33 in Lightroom.

Photo 5: 1/40, f8, ISO 640, ISO 6400. Increased by 3.33 in Lightroom.

spdtdl.com/Tutorial-Galleries/Sony-A7RII-ISO-Invariance
You can download 1 set of bonus photos from here.

Essential reading: dpreview.com/articles/7450523388/sony-alpha-7r-ii-real-world-iso-invariance-study

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