Sigma Lenses Terms...
APO:APO or apochromatic lenses are made using a low dispersion glass to reduce chromatic aberration.
DG:A DG lens can be used with both 35mm SLR and digital SLR cameras. DG refers to additional optical coatings that are meant to minimize reflections of light off the sensor itself.
DC:A DC lens is designed so the image circle matches the smaller size of a digital SLR's image sensor compared to a 35mm frame. These are typically lighter than DG lenses but are not suitable for 35mm SLRs.
EX:An abbreviation for the "Excellence" range of lenses. These lenses are similar to Canon's L series (Canon's professional range of lenses).
DG:A DG lens can be used with both 35mm SLR and digital SLR cameras. DG refers to additional optical coatings that are meant to minimize reflections of light off the sensor itself.
DC:A DC lens is designed so the image circle matches the smaller size of a digital SLR's image sensor compared to a 35mm frame. These are typically lighter than DG lenses but are not suitable for 35mm SLRs.
EX:An abbreviation for the "Excellence" range of lenses. These lenses are similar to Canon's L series (Canon's professional range of lenses).
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