Take them yourself on your smartphone and hope that at least some of them are in focus and good enough to use?
Clip your camera onto your harness in the morning, and find it still there when you take your gear off at the end of the day, so get your clients together for a quick snap before they take their climbing gear off?
Give your phone or camera to one of the clients and give them the job of team photographer?
Or see that your client is snapping away through the day, and take advantage of the fact that he is a professional photographer, and ask him to send you the pics?
Back in June I did a series of indoor climbing workshops at Arc’teryx Piccadilly, along with a presentation, “An Evening with a Mountain Guide”. Everyone who was at the presentation had their names put in a draw, the prize being a day in the Lake District with me, courtesy of Arc’teryx. The winner was Tariq Sheikh. He and his partner Maya already had a holiday planned to Keswick, and it was great that I had a free day during their stay.
Tariq classes himself as a beginner, and this was Maya’s first experience of rock climbing, so we headed off to Brown Slabs on Shepherd’s Crag in Borrowdale, a lovely venue for novices.