I got the 180CV 10-15 years ago when it was "dumped" in a local fire sale. It's a lens I use on and off. The images delivered are sharp and largely, but not entirely, as devoid of colour artefacts as the APO designation indicates. Focusing is hampered by the very short focus travel towards infinity. The package overall is tiny, relatively speaking. Add a 49-52mm step-up ring and the 180/4 combines with say 24/2, 50/1.8 (or a 55/105 manual Micro-Nikkor) to make a very nice compact travel kit for the Df.