I agree on your choice of lenses. I use the 24-105 f/4L IS, 70-200 f/2.8L IS, 16-35 f/2.8L, 100-400 f/4-5.6L IS & 600 f/4L. I find all of these lenses work great because I love landscape & wildlife photography. I use a CanonMark III & the 5D.I also keep a 1.25x converter in my bag. Keep up the good work. BestRegards.