Epson R-D1s - Manual (Page 17)

Getting Started 17
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Determining the Effective Focal Length
The CCD sensor in this camera is an APS-C size, about 34% smaller
than the area covered by a 35 mm film. This effectively increases the
working focal length of the attached lens by 1.53x to produce the
equivalent 35 mm focal length.
For example, if you use a 50 mm lens with this camera, the effective
focal length would be 50 × 1.53 = 76.5 mm.
The focal length conversion table on the rear panel of the camera shows
equivalent 35 mm focal lengths of the lenses attached to the camera.
DUMMY