Despite the variety of Canon lenses that I own, but this is always my favorite because its picture quality second to none. I can see from the slide, which I did with the 100 macro, its sharpness is absolutely crisp and even with only a slight dimming even after years. From Aperture 8 everything is perfect anyway. However, the maximum aperture of 2.8 can also outstanding portrait shots with selective depth of field to which succeed also very good with the lens, which speaks for its versatility. Many tests - among others in Color Foto - have repeatedly shown that the 100mm macro lenses are the beseren portrait lenses and to provide more versatile. It is working very well and is solid and heavy in the hand. Of course much quality has its price, but the objective is worth every buck.