Needs some ideas and suggestions.I have 2 kids, nearly 4 and 6, that I love to photograph.
The best shots I tend to get with my 100 2.8 L macro. The 50 1.8 has been useful and the 70-300L ( its F4 from 70-110) is also good.
I am unlikely to ever go fullframe, so Aperture F4 doesn`t really cut it as it might with a ff sensor. So its 2.8 or brighter. If I was going ff I would get the 24-105L.
The flexibility of a zoom is pretty important as the kids don`t sit still long enough. But if I don`t find a suitable zoom lens, I will get a Canon 85 1.8
From experimenting with all my lenses, what I would like is a 40-140 2.8 L IS USM.
There is plenty of good 17-50/55 2.8 lenses, but they are just a bit short for what I would like.
What zoom do you use for portrait work on a cropped body?