[quote=“JakeGrafton, post:40, topic: 45406”]Ma question est la suivante. Sur le site Technikdirekt par exemple, on trouve deux objectifs ayant presque la même dénomination :
- Sigma 70-300 F4-5,6 DG Macro
-
Sigma 70-300 F4-5,6 DG APO Macro?[/quote]
Quote du site de Sigma :
[quote]The major difference between these two lenses is the optical performance. The DL Super model features a more conventional, achromatic optical design and uses one element of Special Low Dispersion glass (SLD). Its sharpness and contrast are rated very highly, however it is not quite as good as the APO Super model, which uses an apochromatic optical design and uses three SLD glass elements. This model has been top-rated by independent photo magazines. The APO Super model is also somewhat more expensive than the DL Super mode. If you plan to make very large enlargements from your negatives or slides, the APO Super lens may be your better choice.[/quote]Grosso-modo la version APO apporte un élément supplémentaire pour diminuer la dispersion des rayons et par là même les phénomènes d’aberration chromatique. Donc oui il faut prendre ça et oui le caillou en lui-même vaut le coup.