Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pentax Flash

The product arrived in a timely manner. I had purchased this for my novice daughter and we were expecting the unit to be compatible with a Pentax 100D which it was not - well not exactly. It functioned but there were no automatic features that were needed. In truth, I thought I was ordering a Pentax AF-500 FGZ which would have been compatible with the 100D. Had documentation advising of the incompatibility been available on the order page, I would not have ordered it. Instead there was mention of other cameras it was compatible with but not the ones it was not. Picky maybe but for a novice photographer it was important. Pentax accessories are usually compatible across a wide range of models.So far the usual promptness in both the order process and the return process Amazon provides has been exceptional.