Instruct: Classify Amazon reviews into positive or negative sentiment
Query: one was great but the other was not.....

Recently we went on a honeymoon safari in Africa and before leaving we had asked for these as part as our registry here on Amazon. I should have checked out both pairs before leaving but I figured that if they are brand new why should I have to. First day of the safari I went to zoom in and realized that the center focus ring was sliding in and out, it should not do this, it should only turn. I was wondering why I was having so many issues as to where my wife was not, her's were working fine. I was screwed and my only way to focus was to push/pull the center focus ring. As soon as we returned I contacted Barsaka's customer service months ago via email and still have not heard back. If you do purchase these make sure that they are working fine before you leave for your trip/outing.