Even Ken Rockwell (no big fan of Sigma) says this lens is extraordinarily sharp.

Of course he also says it may not work with a camera 10 years down the line. Guess what? Some of Nikon's own lenses may not work with Nikon cameras 10 years down the line. AF and AF-D Nikkor lenses won 't autofocus with some of their DSLR cameras and their current G series lenses are essentially useless on their older film cameras due to the lack of an aperture ring.

But he had to dump on Sigma in some way after being forced to say how sharp the lens is.

I know there is a similar question being discussed right now, but I have a more specific sling strap question.

I want to avoid using a strap that uses the tripod socket; I would prefer that the strap attach to one or both of the strap lugs. Does anyone have thoughts on the:

Boss Strap <http://www.bhphotovideo.com/c/product/878356-REG/BosStrap_bosg315_Generation_3_Sliding_Sling.html>

vs. the

Optech Utility Strap <http://www.amazon.com/dp/B003T0EYVE/ref=wl_it_dp_o_pd_nS_ttl?_encoding=UTF8&colid=2CSRTMBH2SV8V&coliid=I1ETAJF4J774EU&psc=1)?

Thanks.