Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lighter than I had expected

The BP-80 by Opteka was a lot lighter than I had expected. The plastic shell adds little weight to the camera, most of my lenses outweigh it. The convinence of using AA is extrememly helpful, especially if you are in locations where it is impossible or impractical to recharge the lithium-ion batteries. The grips on the battery pack work well, I enjoy using the battery pack to do vertical portrait shots. On the downside, the shutter release is somewhat unpredictable, it doesn't have the feel of the camera's shutter release. At times, I've had to push quite hard in order to take a pic, which can cause blur do to small vibrations. Another downside is the battery pack cover keeps opening up. This doesn't cause any problems with the opperation of the camera, but it is still anoying.