XPro-1 framelines question.
Viewfinder magnification switches to 0.37x when the 18mm lens is mounted, and to 0.60x for the 35mm or 60mm lens, letting you frame your shot with the bright, crystal clarity of an optical image. You can also manually set a focal distance and switch between viewfinder magnifications by holding down the viewfinder switch lever for over 2 seconds.
So it looks like you can choose any lens focal length, but the viewfinder has 2 fixed zoom settings that you can choose from.
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