Olympus TCON-17X on Sigma DP3 Merrill − Photo Courtesy of Shinichi Taki
Going beyond what these fixed-lens cameras offer in terms of field of view…
On the wide side
Ricoh GW-3 0.75× wide-angle converter − 21mm (FF equivalent) FOV on the DP1 Merrill
The GW-3 screws right in the DP1M 49mm filter thread (ironically, an adapter is required to mount it on the Ricoh GR, for which the GW-3 is designed). I found a significant decrease in contrast when paired to the DP3M, so I don’t recommend it for this camera.
On the tele side
Olympus TCON-17X 1.7× teleconverter − 127mm (FF equivalent) FOV on the DP3 Merrill
Be sure to grab a 52-55mm step-up ring.
There’s no light loss when using the Olympus TCON-17X, as it is designed to maintain the actually used aperture. Good to know: it produces images with dark edges in conjunction with shorter lenses, like those on the DP1 and DP2.
Both converters will be usable on the dp Quattro series with appropriate step-down rings (58mm to 49mm and 55mm, respectively).