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Examples of Focus Shift with 50mm Lenses

In the examples below, focus wide open was aimed for the “10” mark. Note that all results are at a “head and shoulders portrait” distance, about 42 inches for a 50mm lens.

Video

Watch focus shift with the Nikon 50mm f/1.2. View full size.

Example — Canon EF 50mm f/1.2L

Focus shift is strong, moving accurate focus back about 1.5 inches (marked) at f/2.8. Even f/5.6 cannot compensate for the shift.

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  • 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.


   
Figures 3a/b/c: Canon 50/1.2L: apertures f/1.2, f/2.8 and f/5.6, focused at the “10” mark at f/1.2.

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