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Nikon Pro Loupe 4x - diameter?

The physical diameter of the loupe, or the size of the image circle? The latter is around 46 mm on the 7911 model.
 
The physical diameter. I need a smaller loupe for my 4x5 camera. My Pentax 5.5x loupe, with a diameter of 70mm, is too big for the 4x5 ground glass.