I do not own, nor have I used, the 75mm. At this point, I have less than a year of experience with the 60 mm macro. I bought it for close-up work. It is stellar. It is startlingly light, all plastic, except the mount. That said, there is no indication of any problems with wear or the mechanisms. It is my first macro lens and I find it much more effective than working with tubes or close-up lenses. It also seems fine for normal photographic applications.