The Fujifilm X-Pro 1 has a viewfinder which can switch between an electronic mode and an optical mode with an electronic overlay. One of the key features of this overlay is a "bright frame" — the optical finder shows a good deal more than the expected coverage area of the lens, and the bright line is supposed to show the actual frame.
But, in my experience, the frame line is drawn much too small — there's something between 5-10% off each side. Some of this is surely to cover for the parallax error (since it's not a through-the-lens finder in optical mode), but it seems like Fujifilm could have made the tolerances a little closer. As it is, I'm getting used to cropping in post — or switching to the EVF for critical composition, which is annoying, since the optical view is so much nicer for catching fleeting expressions.
I understand why lower-end DSLR viewfinders don't offer 100% coverage, as there are considerable and obvious savings in size, weight, and cost. But in this case the viewfinder shows a considerable margin outside the line: the overall finder is more than 100%. Since the bright frame is drawn electronically, why isn't it drawn to more accurately match the field of view of the mounted lens?
Fujifilm has clearly put a lot of work into the design and photography-focused user interface of this camera, of which the hybrid viewfinder is a centerpiece. So, surely the viewfinder frame lines work this way for some good reason. What is that reason?