I do. 2x magnification is too much to see the 50mm brightlines. I originally intended it to help focus a noctilux but it requires a two step process. Flip it down, focus, and then flip it back up to compose. Even then, there is probably error introduced because of the physical length of the magnifier. There is a clip that engages when the magnifier is down which makes it too difficult to quickly flip back up. I had to remove it. Also, the rubber eye cap has a tendency to fall off when the camera is taken in and out of my shoulder bag. In fact, the whole thing has a tendency to get caught up on things.