The mount for the wide angle lens is the same size as the 3x, 8x and 16x. Just because they fit doesn't mean that they were intended to be used on the housing. The extra lenses are meant to be used with the FIXED FOCUS of the DC310 because it didn't have a zoom capability. Because you can zoom with the DC500, you don't need them. Using your zoom instead of flipping through all the lenses and trying to determine the correct distance to be from your subject, gives you much better, sharper images. Yes, I have experienced a couple of lessons with my new DC500, but many of them were my fault, not the camera's. Sealife's customer service will answer any questions you might have. They spent about a half an hour helping me with everything from appropriate defog for the port to settings for the strobe etc.