I bought this lens because it came highly recommended. It has stunning resolution. It feels good. Working close up you need the manual focus because it focuses on something perfectly, but not always the right something. To get the depth of field a tripod is a must to work with slow shutter speeds and ISO100. But I so love this lens. There are things I have worked with for 20 years and barely seen the holes. Now I see in intimate detail the dust on the inside of the holes! It deserves 6 stars!