Thanks to forum members I bought the Yongnuo 600EX RTII rather than a Canon Speedlite as a replacement for my malfunctioning 430EX. I'm now looking at interval timers for my 6D and 70D. Looking at Adorama's website there are many to choose from, too many for a novice like me. Which one do you recommend? I'd like to set up either body with my old model 100-400 L and photograph the wildlife that visit my bird feeder by taking a photo every few seconds. This will be a Christmas present so I'd like to go as cheap as possible.