A:Answeryes, it can hold these camera bodies! Now what lenses you put on the body may make the difference. I put my Fujifilm xt2 and a 16-55mm lens on the tripod and it holds it well. Probably wouldn't hold it up with a 70-200mm lens on.
A:AnswerThe SMART clamp included in the kit is for smartphones, and will not hold a tablet. The JOBY GripTight PRO Tablet kit includes a clamp/GorillaPod large enough to hold up to an 11" iPad Pro. There is no JOBY clamp large enough to hold the 12.9" iPads at this time.