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Carl Zeiss ZF.2 135mm f/2 APO-Sonnar T*
Nikon 135mm f/2 DC
Carl Zeiss ZF.2 135mm f/2 APO-Sonnar T*
Zeiss ZF.2 135mm f/2 APO-Sonnar T*

Compared to Zeiss 100mm f/2 Makro-Planar (D800E, Rulers on Table)

The setup reveals the color correction differences between the Zeiss 135mm f/2 APO-Sonnar and the Zeiss 100mm f/2 Makro-Planar.

The “APO” designation is not a well defined concept, being used loosely by so many manufacturers and having a different standard for each, so actually looking at the differences is the best way to understand what the upgrade to APO means.

Focusing benefits

The APO designation is not strictly a finished image quality issue: focusing accuracy is critical on high resolution digital, and so the elimination of longitudinal chromatic aberration (LOCA) is a very practical benefit of APO that the APO-Sonnar offers and that the 100/2 Makro-Planar does not, LOCA being the one significant shortcoming of the 100mm f/2 Makro-Planar.

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ZF.2 100/2 Makro-Planar   Carl Zeiss ZF.2 135mm f/2 APO-Sonnar T*
ZF.2 100/2 Makro-Planar and 135/2 APO-Sonnar

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