Folks, I will keep this brief.
A few months ago, I purchased a Sigma 28-300 SUPER ZOOM from Dell...After using it for the trip I had planned, the locking mechanism started to fail and the image quality went from pretty good to way bad...
I called dell and they told me to send it back them (DELL) and that it would take about 6-8 weeks to get it repaired or exchanged...I said that is not acceptable...They said, there is nothing they can do about it...
two days later, I called Sigma and a very nice lady told me to simply make a copy of the invoice and mail it in to them directly...I did and less than a week later, I had my new replacement lens...
When I called back to thank her, she said, that when ever any Sigma product needs repair or replacement, contact them direct and they will take care of it...I thought I would pass this on...
Sigma - Support - Contact
''Pentax'' are you listening?