Instruct: Classify a given review into positive or negative sentiment.
Query: Canon 580 EX II

This flash replaced my old 550EX. It is smaller and a bit more powerful. The camera mount and the battery compartment design are a great improvement from the 550EX. Only shortfall so far is that it seems to create a hot spot in the center of the images in the 24-50 mm zoom range when used with the 40D Canon Camera; works fine in the EOS 1Ds series.