Works for me (wearing glasses) good with the DX camera, but not with the full-frame camera

I bought me this magnifying order to make the manual Zeiss 135/2 on the Nikon D700 (full-frame, FX) can better focus.
After attaching I had to adjust to a level the diopter compensation.
Unfortunately, I can no longer overlook the entire frame with the eyepiece.
I need a little turning back and forth or move the camera to see up to the edges of the viewfinder can upside down.
That annoys me very much.
The increase is in itself helpful in focusing, for me but not indispensable.

At the Nikon D1 (DX-format) but the eyepiece for me worked very well, since the image in the eyepiece here is smaller because of the smaller sensor.
By magnifying the viewfinder image appears now felt almost as large as that of the full-frame camera.
In addition, the eyepiece is a little further back on the camera, which I find pleasant, as you now no longer so badly suppressed as the nose on the camera body.