Quote Originally Posted by Xmas View Post

It is also possible for a Kiev (or Contax II) to leak light from the viewfinder volume down through the gap between the shutter crate and the main chassis (just above the sprocket shaft,) unto film inspect the negatives carefully before blaming the yack hair, a Contax II does not have (or need) yak hair...

O lawd don't I know this.
I have a Kiev with this issue and the telltale leak usually shows up as a funnelish shape emanating from the bottom of the frame after development (top of film when in camera). This can start from outside the frame and show sprockets.

I tried 4 times to no avail to solve this issue and finally gave up and got a Contax II.