" You can feather the edge of the cut to blend it."
How would you suggest to feather the edge? My process is to take the contour marked on the plexi-glass and cut a cardboard mask that will fit in my Cokin holder. Then carefully line up the edge of the mask while looking through the stoped down lens. I then make my two exposures on the same frame. Feathering the edge would make lining up things a little less critical. As it is now the process makes the ultimate hard edge, and allignment has to be bang on.
Any suggestions would be appreciated.