Instruct: Classify the given review into positive or negative sentiment.
Query: Great camera - BE CAREFUL with legacy K-mount lenses

Great camera... good quality pictures... easy to use... all of these are true of the K100D.However, one thing that hasn't been pointed out here is that you need to be careful, make that very careful, with older lenses especially if they are not Pentax brand. My dad left me a number of "K-mount compatible" lenses that were sears branded. Not only would none of them work on this camera one of them actually got stuck on the body of the camera and will not come off. Apparently they must have violated the letter of the k-mount spec in such a way that something is hitting. The lens went on easily, just like any other lens... but now is going to cost me as much as half the cost of the camera to remove.