Read some reviews. When using this eyecup, the corners of the screen will be rounded and the exif info at the bottom will not be visible. Is it true?
If you wear glasses like me... maybe... but I can still see the exif data.
Rounded ? er... neber notice.
It does help in MF.... I would recommend it.
TS... get a FA 50mm 1.4 (if got $) or Pentax-A 50mm f2 (if no $)... you will be nicely suprise by the bokeh.