Very interesting lens

I have this lens bought used and I am satisfied with the performance of the offered. A 135mm with really usable open aperture of 1.8 is equally valuable as a 200 at 2.8 in terms of exemption and speed. As such the objective is "easy" to refer not only to be very compact, but even as. Although is "easy" to see very relative in the face of honest 1175g lens weight. After all, you can use this lens fully free hand.
In sum one can characterize the lens very good thing:

+ Very fast and more accurate AF
+ From maximum aperture of 1.8 over the entire image field uniformly sharp

- Mechanical AF without manual override
- Very good, but not extraordinary sharpness. Increases only marginally by stopping down.
- Visible, but not annoying color fringing (chrome aberrations.)
- Extremely heavy (1175g with sun visor)