The old Rheinmetall Perfekta. What's really fun, and kinda freeing about this thing is its simplicity.
Exp. is either 1/25" or Bulb.
Focus:
f7,7 4,5m - 40m (14ft - 131ft)
f11 3,8 - inf (12ft - inf)
f16 3m - inf (10ft - inf)
Sharpness seems to drop at ~50m (164ft), but stais at this level to inf.