Hello everybody,


I am hoping someone can answer a couple of questions I have.


First, I recently bought a canon lens -- refurbished -- and it came with a warranty card which stated "international warranty" across the top, then "canon usa canon canada" directly beneath. Given my chronic disorganization, I couldn't recall nor locate other warranty cards for Canon products and I'm wondering if the warranty is valid in the states. I expect it is, from the Canon USA entry, but I'd like to double check. fwiw, the vendor states that the item has a "usa warranty."


Second, I have some lenses that have seen rather hard use over the years. They still work, and still help in taking nice photos (sometimes! ;-) but I'm wondering if there is a rule of thumb or whatever for how to care for lenses. For instance, do you have them recalibrated or otherwised renewed after x number of years? Is such a thing helpful? Expensive? I'm just looking for general information here & appreciate any & all help.


cheers.