The Keni is similar to the earlier Yale camera from Adams but accepts different types of film and plate holders. It was produced in 3 ¼" x 4 ¼" (model 1) and 5" x 4" (model 2) sizes. Originally an f6.5 Cooke lens was fitted. In c. 1904 the lens was changed to an f8 Rapid Rectilinear and a 'model 3' fitted with an f6.3 Goerz was introduced. Production ceased after a few years.

As well as a changing box the Keni could be fitted with double dark-slides, roll-holder, film pack adapter or Makenzie-Wishart holder.