Don, the 2nd son wrote:
I've been happy with Raynox for awhile but wonder what secret might there be? So far I have just snapped it on my sharpest lens and enjoyed the result.
I could not get acceptable images on my Sigma 105 mm went back to my old Lester a dine 105 mm and results have been much better my biggest issue is I am so used to using one-to-one macro I know exact distance I need to be so it is a lot easier to catch Focus quickly with the add-on lens much closer so not as easy to find