Thanks for the comments.
Karl, yes I've used it with the 105mm. But, with the 60mm, cutting down on the water between subject and lens, seems to really sharpen the overall image from what I was getting with the 105mm. Reminds me a bit of using the stack macros on the 5050. You get very close to the subject.
The 60mm seems to be a better option for slow moving or stationary subjects. You wouldn't think that little bit of water would make much difference but to me it's pretty obvious as the images are much sharper. To my eye anyway.
It's such an inexpensive piece of glass, I'm really impressed with the results myself although, I seem to recall some saying it wasn't really all that good. So, that's what I'm asking for. Overall opinions on the sharpness or anything else. I've taken to looping the lanyard through my spoting light arm and letting the diopter hang loose until needed.
Rand