I just sent my Nikon M511 in for service recently, they replaced the outer rubber and installed new lenses that I had scratched up., I don't have a receipt and have sent these in before and they replaced the eyepieces, never a problem and no charge. They told me lifetime warranty on Nikon Bino. Years ago i had a pair of burris Binos, really liked them until they stopped working, Burris at that time got out of the bino business and left me high and dry. Not a Burris fan boy after that! I think Nikon and everybody has to give lifetime warranty's anymore because of vortex influence.