It's difficult to focus at f1.8 with a 135mm focal length, even with a viewfinder and enlarged view. The image quality seems disappointing, especially wide open, judging by my first few shots. Contrast is low, the edges just glows green in highlights. Of course this is not conclusive, as I have only used it for a handful of shots. I also need to get a hood for this thing, but the 82mm filter thread proved to be a challenge for hoods. I can't find one from a full tub of hoods that I have, and 77mm is the largest I have got. Will test again later this week.
Dillon -- NEX-5N & Apollo 135mm f1.8. click for larger.