I have found this combination superb for aquarium photography. I don't use anything else at this time for this type of photography. I must admit though, I know I'm going to one of these places in January but I'm goiong to take my Sony NEX-5N and a fast CV prime manual focus lens with me. The APS-C sensor should be better in low light for this (high ISO). The lens I'm taking is also faster than the Panasonic 20 f1.7. I'll post some images when I return and let you know how things turned out. I am also doing a first next month. I'm taking a system that is totally manual. Not a single autofocus lens at all. I hope I'm not going to regret this.