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4 APO

Three APO lenses compared on the 36-megapixel Nikon D800E. Only the Sigma is in production as of 2013 with the two others having been discontinued but available on the used market.

A high performing apochromatic lens should eliminate both longitudinal chromatic aberration (LOCA) and lateral chromatic aberration (LCA), and as related effects, it should also minimize secondary longitudinal chromatic aberration, spherical aberration and spherochromaticism.

There is no marketing definition for “APO”. Hence each vendor is free to correct for color to the extent deemed appropriate for the idea.

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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

Make better images by learning how to get the best results right away.
Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.

vs Voigtlander 180/4 APO-Lanthar

Sigma 180mm f/2.8 APO-Macro DG HSM + Leica 180mm f/2.8 APO-Elmarit-R + Voigtlander 180/4 APO-Lanthar (not shown)