I have a non-micro 200mm f/4 AIS. It has a 52mm filter thread, it stops down to f/32, it has nine aperture blades. The inside of the barrel behind the rear element is lined with velvet! The built-in hood is lined with velvet also. It does not focus very close (around 6-1/2 feet). The focusing throw on the AIS version is just okay (1/2 rotation to get from infinity to seven feet). It makes wonderfully sharp, aberration-free images as long as you use it with film. The bokeh is okay, depending on subject matter, focus distance, and aperture. Just get one, they're practically free. I love mine, even though I shoot mostly wides and normals.