Hi there,
I was looking for a good quality budget tele for my K3 and I found the Sigma 70-300 APO macro, just before I click the purchase button on Amazon I got a warning of "California Proposition 65", as far as I understand that means the lens contains hazardous chemicals in the material, I purchased lot of stuffs on Amazon and this is the first time I got this warning, I don't know how serious it is in affecting our health, since it is an old and used lens so wear and tear are expected, hazardous chemicals will be released more than when it was new, I hold my purchase and started to look for something else comparable to the Sigma, any comment ? btw I got the 55-300 HD and used heavily and now it failed to focus, I want something else that work FF as well.
PS. I got the warning with the cell phone app but not found on the full site, you may want to try this link or simply search for the lens.
amazon.com : Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto Zoom Lens for Pentax and Samsung SLR Cameras : Camera Lenses : Camera & Photo?tag=pentaxforums-20&