I had problems with my Tamron SP 17-50 lens, often losing focus. Service technicians have done the right thing, and I already have a fully functional lens. As a bonus I got brand new rubber rings for zoom and focus bracelets. Thank you!
After purchasing a Pentax K3 body, I found that my lenses are not accurate in different lengths. I use zoom lenses mostly. In the workshop they made correction in the body so that all the lenses are now with a precise focus. Thank you!