Bowser writes:

That's OK. Most of us rarely take Sigma seriously. Except for the
occasional good lens, most of their stuff is crap.

Sigma is one of the most aggressive lens companies lately, and has made
some outstandingly good lenses. I've never had a bad lens from them.
(Then again, I've chosen all my lenses, from them and others, after
considerable research.)

(Happy owner of Sigma 105/2.8 macro, 12-24/4.5 full-frame,
120-400/4.5-5.6).
--
David Dyer-Bennet, ; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info