Epson r-d1 - Rangefinder Digital Camera User Manual page 17

Determining the Effective Focal Length
The CCD sensor in this camera is an APS-C size, about 34% smaller
than the area covered by 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. This is particularly helpful
when you are using a telephoto lens, because you can use a 200 mm
lens to achieve the same field of view of a 300 mm lens, which is heavier
and more expensive.
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
17
Getting Started
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