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Sony A6000+ Zeiss ZM 35/2 Biogon
Leica M240 + 50/2 APO

Case Study: Format-Equivalent F-Stop: APS-C vs 35mm Full Frame (Pellegrino)

Here we examine two 24 megapixel cameras for format-equivalency in depth of field and f-stop terms. The goal is to show that the equivalency is indeed there for two formats of the same aspect ratio (APS-C and 35mm full frame).

Leica M240: 5976 X 3992 (23.86 MP, full-frame sensor)
Sony A6000: 6000 X 4000 (24.0 MP, APS-C sensor)

Neither camera utilizes an anti-aliasing filter.

Format equivalent focal length

For an equivalency comparison, the field of view must be matched by keeping the same position (perspective), utilizing the format-equivalent focal length for the smaller sensor. That means using a 35mm focal length on APS-C to match the 50mm focal length on full-frame.

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Diglloyd Making Sharp Images articulates years of best practices and how-to, painstakingly learned over a decade of camera and lens evaluation.

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  • Eases into photographic challenges with an introductory section.
  • Covers aspects of digital sensor technology that relate to getting the best image quality.
  • Technique section discusses every aspect of making a sharp image handheld or on a tripod.
  • Depth of field and how to bypass depth of field limitations via focus stacking.
  • Optical aberrations: what they are, what they look like, and what to do about them.
  • MTF, field curvature, focus shift: insight into the limitations of lab tests and why imaging performance is far more complex than it appears.
  • Optical aberrations: what they are, what they look like, and what to do about them.
  • How to test a lens for a “bad sample”.

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

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