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A lens with a great reputation. Solidly built. Sharp copy. Free shipping. Top condition. Pics are of the actual lens. You will notice air bubbles in the lens however this does not affect image quality. This does happen and passes QC at factory.
"APO lenses use high reflective index and low dispersion glass in some lens elements. This special glass normally has some tiny air bubbles but it does not affect the optical performance of your lens. YES, it is normal"
This Sigma fast fixed aperture makes photography easier for the photographer who wishes to precisely control their depth of field and also for working with non TTL Flash systems.