Quote Originally Posted by Newt_on_Swings View Post
What's the difference from using a 1:1 accessory viewfinder and keeping both eyes open and the kontur? If you do that frame lines are seemingly projected as well.
I don't know, but I can say the with a Kontur finder it's black and the only thing you see through it are the frame finders. This may make it easier to superimpose with the image seen by the other eye, but this is just a guess.