Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lens faults

I purchased this lens to attach to a Nikon D-60 SLR camera. It was to be used in my many excursions with a travel/exchange group. This year we went to Turkey. At first I was satisfied with the lens but it commenced to give me camera errors that read sort of," Lens not fully attached to camera". To correct I locked the lens and tightened. This happened approximately 15-20 times in an eighteen day period. Also, the lens developed numerous spots. In handlind the lens while on the camera I either put the lenscap back on, or cupped my hand over the lens to prevent burning, and was in a very dry area. I would try another one in the future if I can be assured the manufacturing and quality assurance has improved. I am NOT an expert in lens quality, but believe this particular lens is and was faulty.