I bought this grip to mount my Canon 5D Mark II onto. When I first received my package and unwrapped the grip, I felt that there was no way this lightweight grip would be able to handle my 5Dii. Once I mounted everything together along with a 16-35L and a 580EX Speedlite, I was surprised that this grip held its own very well. Bower XBGCD5 Digital Power Battery Grip for Canon 5D Mark II. Neewer BG-E8 Replacement Battery Grip for Canon EOS 550D 600D 650D 700D/ Rebel T2i T3i T4i T5i SLR Cameras. Again, note the cushier eyepiece of the Canon 5D Mark IV (right). The 5D Mark IV sits up higher than the 6D Mark II. It’s also a bit wider. But the 6D Mark II offers just as much grip depth – though the grip area itself is narrower. Folks with smaller hands will like the form factor of the 6D Mark II for sure. Here we go, I don't write reviews often. Actually the only other review I wrote was when I got Scott Kelby's book "Digital Photography". Anyway, I used to own the 5D and I had the canon battery grip for that camera. I then upgraded to the 5D Mark II and I had just bought the canon battery pack for the flash (which is sweet by the way). Canon 5D Mark II is designed for baby-sized hands. I have to pull-in my big American fingers and thumb to hit buttons, unlike a Nikon F5, which is designed for adult hands. The grip is also too small; my fingertips are always hitting the front of the body as they wrap around the grip. The 5D Mark II is covered in hard fake rubber. bJKrwH.