Originally posted by thibs But why a 180/2.8 AND a 150/2.8 in Sigma lens range ?
That's a good question. They have very similiar optical construction and MTF charts. So maybe, they are variants of the same design.
Notable changes:
1. With the addition of the 180mm (in K mount too (PA)), Sigma Germany now eventually dropped the PA variant for the 150mm).
2. The optical stabilization will be absent in Sony and Pentax (SA, PA) mounts. The 150mm in Sony mount has OSS.
So, as far as my LBA is concerned, this gives me reason to own a Pentax 100mm WR
and a Sigma 180mm