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Zeiss 85mm f/1.4 Planar: Dual-Focus Aperture Series 'Radio Towers' (D800E)

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This unusually instructive aperture series uses dual focusing positions (two series) which allow insight into how color correction affects out of focus rendering in particular.

The two focusing distances are shown in order to emphasize how focus affects color blurs, including the magenta/green color blurs of secondary longitudinal chromatic aberration and the violet halo of longitudinal chromatic aberration. Lens aberrations off center are also evaluated.

Zeiss 85mm f/1.4 Planar Dual-Focus Aperture Series 'Radio Towers' (D800E)

A derivation of this page has been cross-posted in Making Sharp Images as a case study on secondary longitudinal chromatic aberration:

Case Study: Secondary Color Variance with Focus

Radio Towers
Nikon D800E + Zeiss 85mm f/1.4 Planar @ f/1.4
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