About a year ago I purchased a new zoom lens for my camera (for search engine purposes I'm going to give the full model info - it's the Tamron SP AF 70-300mm F/4-5.6 Di VC). The first real trip I took with it was to the Cayman Islands this past Christmas. It performed beautifully. Except when it didn't perform at all. Certain photos, specifically when I was near 300mm and pointing the lens more or less at the sun, would cause my camera to say there had been an error in the communication between the camera and the lens. Although it was very infrequent, I decided when I got home to send the lens in and see what would happen. Today I received the note that they were 'adjusting or replacing the aperture assembly'. Which was also what I found when I went searching for the error on websites after it happened. I'm pleased that the lens has been fixed, but it always makes me nervous when something happens to more than a few people - will I have to be concerned about the lens doing this again? I'll keep my fingers crossed!