I have the cheat sheets for the 50mm lens, and they have been my go to. I have a very active toddler and I try my hardest to keep my focal point on his face or in his eye to keep the subject clear, although for some reason I still get blurry pictures from time to time. I use the cheat cards for child portrait. Should I use a different card, or do I just need to really focus on keeping my focal point on? Is that the whole problem to begin with?