Agreed, I have the AF 105 micro also. I use this lens mainly when I want high-magnification, or I need AF. The focus ring good for an AF lens with the right amount of resistence and smooth, but with a dry plastic on plastic feel, lacking the silkiness of the AIS version. Also, the focus throw near infinity is very short - infinity to 1:1 with 180° focus throw requires a very fine touch. The AIS 105/2.8 micro goes from infinity to 1:2 with 300° focus throw - which is at least 3x longer to focus the same distance. Even that is short compared to the AI 105/2.5.
What I like about the AIS 105.2.8 micro is:
- most compact of the 105 micros
- good old build quality
- smoother bokeh than AF version
- f2.8 aperture fast enough for general shooting
- 1:2 magnification is more than enough for casual shooting and closeups