i want to try out macro photography with my epm1 and p45-200 tele. looked into the neewer metal extension tubes and they do seem like a great deal. however i did read on amazon that they can cause damage to the camera electronic contacts (just one incident reported though) and that their lack of anti glare/matte coating (in the inner surface) makes their use limited. so am i better off getting something else or are these issues unfounded? any help, is appreciated.