I know of no official reason for this change in his career focus but surmise that several factors were at play. Byron’s first child, Aileen, was born on January 13, 2012 and his second child, Lloyd was born in 1914 with Donald following in 1917. This would have dictated more flexibility and time at home which is evidenced by the dates of subsequent photographic trips. The outbreak of war in Europe certainly dampened alpine activities during the war years. Also, many ACC members were by now accomplished amateur photographers and the focus of the Canadian Alpine Journal shifted to include broader contributions from members.
Primarily, however, Byron began to organize his own expeditions, hiring guides and outfitters as required and planning the trips with photography as the primary goal. I know from records in the National Film Board of Canada Archives that a feature film covering the journey from Lake Louise to Jasper and Mt. Robson was completed by 1917 although no copy of this film has yet been found. Byron’s love of storytelling came to the fore with cinematic staging of wilderness activities evident even in the still photographs of these excursions.