I have a g12 camera with the Canon housing and recently purchased an Inon macro wet lens with the adapter. I have compared the macro photos taken with and without the Inon lens and don't see any improvement. When using the Inon lens, I have tried zooming so that there is no vignetting and I have also not zoomed and then cropped the round edges on my computer. I am using the manual settings on the camera. Of course, I purchased the lens so I could get even better macro shots but that's not happening. They seem the same. Am I doing something wrong? Thanks!