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| Förkortningen betyder |
| DF = Dual Focus |
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| Förklaring från Sigma |
| The DF (Dual Focus) system disengages the linkage between the internalfocusing mechanism and outer focusing ring when the focusing ring ismoved to the AF position. This system provides easy and precise handlingof the lens, since the focusing ring does not rotate during autofocusing. Thewide focusing ring also enables easy and accurate manual focusing. |
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| Nikon D2X |
| Nikon D600 |
| Canon EOS 500D |
| Canon EOS D30 |
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