Dutton and Michaels were talented American professional photographers who worked in Canton (Guangzhou), in partnership from 1863 until their early deaths.  Sylvester DUTTON (1824-1866) and Vincent MICHAELS (c.1832-1864) may have owned and used a ‘Mammoth View’ camera in China. Source: Terry Bennett History of Photography in China - Western Photographers - 1861-1879, Quaritch 2010, pp187-195.