Sigma 50-150mm 2.8 OS vs Sigma 70-200 2.8 OS?

[Frogfish]

Originally Posted by JimC

The newer 50-150mm lens with OS is a physically larger lens with a different optical design.

Even the filter size is different (77mm for the newer OS version versus 67mm for the older non OS version), with different optical elements (14 Elements in 18 Groups for the old version with 4 of the elements using SLD glass; versus 15 Elements in 21 Groups for the new version with OS with 6 of the elements using SLD glass).

Version without OS:
http://www.sigmaphoto.com/shop/50-15...o-hsm-ii-sigma

Version with OS:
http://www.sigmaphoto.com/shop/50-15...c-os-hsm-sigma

Thanks Jim. I am obviously not up to date and on the wrong tack !

In that case for the OP. I'd consider the older 80-200 AF-D as well as the Sigma if he needs the length. Whether the extra 20mm at the wide angle or 50mm at the long end is most useful will depend on the primary purpose of the lens as well as his camera - as the new 50-150 is only APS-C then clearly it has been priced and positioned as the APS-C equivilant of the 70/80 - 200 on FF.