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The Ricoh is tiny, yet with a rock solid feel, built in grip, ergonomically near-perfect, light and vanishes in the pocket. Its B&W conversions, my preferred medium for street photography, are to my eye as good as it gets. You will not get better out of an M9/28 Elmarit ASPH. Absolutely brilliant sensor. The simple, intuitive menu was designed for photographers and not by some remote programmer who's never handled a camera and previously wrote code for a microwave oven.
In addition to an adapter for the 21mm diopter as mentioned above, it shoots Hasselblad squares as well as 35mm mode, though that's at 10MP. The lens is perfectly optimized for the sensor and razor sharp; at f/2.8, no compromises.