135/2,8 Pentacon Electric
Optical construction based on the older preset versions, although tweaked a bit.
Chromatic aberration will show not in blue but rather in red, as with Takumar tele-lenses.
Pentacon Electric has MC coating and sliding sun shield, the work against frontal light is good.
I prefer preset versions because this newer design has longer MFF - about 1,7m compared to 1,5m in preset version.