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Som jeg dog er aktiv i dag.

Hvad betyder betegnelsen APO eller apochromatic på nogle af Sigma's
telezoomer?

Tue

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Jeg skulle vist have taget mig lidt bedre tid til at lede, før jeg spurgte.

Følgende er hentet fra Sigma's hp.

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These lenses use apochromatic design and Special Low Dispersion glass (SLD)
for minimum color aberration and ultimate telephoto image quality, improving
contrast and sharpness.

Apochromatic (APO) telephoto lenses greatly minimize color aberration, a
phenomenon created by different wave lengths of light refracting at
different angles. This causes each color to have a slightly different
imaging point, resulting in poor image quality.

APO Zoom Macros offer up to 1:2 magnification in the telephoto range with
instant shifting from normal to macro shooting.

APO Tele-Macros offer 1:3 image size close focus, long thought to be
impossible for a telephoto lens - and are no larger than a fixed focal lens
of the same class.

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Så blev jeg så meget klogere.

Tue