By Tamron. Tamron USA, Inc., or its authorized agents, will not repair any product that is not an officially imported product and sold through an authorized Tamron USA dealer. In other words, there will be no authorized repair service under any circumstance for gray market products. In such a case, the user must return the product to the dealer at which it was purchased for unauthorized repair service.
Tamron USA, Inc. Six-Year Limited Warranty (Six-Year Limited Warranty Valid in USA Only)
Only Tamron lenses imported officially by Tamron USA, Inc. and distributed by authorized Tamron USA, Inc. dealers carry a Six-Year Limited USA warranty.
Check Authenticity of Your Product: You can check the authenticity of the product you have/plan to purchase by locating the silver hologram Tamron USA Authorized Dealer/Six-Year Warranty logo sticker on top of the lens box. You may also call Tamron at 1-800-827-8880 to verify the serial number.
Look for this logo. Dealers not authorized by Tamron USA, Inc. cannot offer any warranty and cannot use this logo. All authorized Tamron USA dealers are requested to place this logo on their website; however, some dealers, even if authorized, may not have the functionality to add this logo to their website. We highly recommend that you check with the dealer or Tamron USA, Inc. to determine whether the dealer is authorized. You can find a list of authorized Tamron USA dealers by clicking here or by calling 1-800-827-8880.