Ricoh S10 24-72MM F2.5-4.4VC - Manual (Page 25)

[Step Zoom] Setting (Setup)
If [Step Zoom] is set to ON, the focal length for zoom is fixed at five steps
(equivalent to 24 mm, 28 mm, 35 mm, 50 mm, and 72 mm*). * Equivalent to
that on a 35-mm camera.
Notes -------------------------------------------------------------------------------------
• Zoom focal lengths for when a wide conversion lens is attached to the
camera are equivalent to 19 mm, 22 mm, 27 mm, 39 mm, and 57 mm.
• Zoom focal lengths for when a tele conversion lens is attached to the
camera are equivalent to 45 mm, 53 mm, 65 mm, 93 mm, and 135 mm.
However, if zooming is performed at a focal length other than 135 mm
(telephoto side), mechanical vignetting (a phenomenon in which the
four corners of an image become dark) may occur in the periphery of the
image.