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Case Study: Format-Equivalent F-Stop: Micro Four Thirds vs 35mm Full Frame (Pellegrino)
The equivalent f-stop for the same depth of field (DoF) is discussed in Format-Equivalent Depth of Field and F-Stop. Summarizing, the key points are:
- With respect to geometric parameters of optics, there is no difference attributable to format size in the “look” of an image; it is the size of the entrance pupil and its position in space relative to the subject that determines the “look”. Hence equivalent lens parameters generate the same look in geometric terms.
- An equivalent focal length for the format with the same diameter entrance pupil at the same position in space will have identical depth of field as any other format. Hence with the focal length varying for that format, there is (by simple math) an equivalent f-stop for the format.
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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.
