hi i have just got a fisheye inon [165 AD] baynet mount lens for my recsea S95 housing ive noticed i have to zoom in a little or i get a lot vignetting, in fact at its widest setting i have a ugly square around the frame, zoom in a bit and i get the edges of the lens hood in the picture, it takes another zoom to have a decent enough photo [still have tiny bit of black at some part of photo but that is easy to get rid of in PS] does anyone else have this problem