Digging into my literature collection again - here's what Wista says about the 45RF finder:
"The finder is designed to show as much as possible and also to view the field of a 120mm wide-angle lens. The magnification of this finder is 0.45x. Frames in the finder are explained below. The frame for 120mm wide-angle lens is light yellow (the outer most frame). Frames for 135mm, 150mm and 180mm lenses are marked with light yellow colored frames marked the focal lengths. In this case, the image through the finder is 100% at a distance of 6M (20') from the subject. Therefore, the field of view of the finder frame will be about 90% of the image of a subject in infinity. Accordingly, the actual image of infinity is 10% larger than the area in the finder frame."
OK, logging off for the night now. Really.
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