I took this picture during the wildlife babies workshop last June I conducted in Minnesota. I used a 300mm lens, and because the light was low the lens aperture had to be quite large -- f/4 in this case. That meant that depth of field was very shallow, and in turn that meant that in order to get both mother and cub in sharp focus I had to wait until they were on the same plane. In other words, when they were the identical distance to the camera, they would be sharp. If the baby were, say, six inches closer to my camera or farther away, and I focused on the mother, the baby would be almost sharp but not quite. That obviously would not be acceptable. I watched them through my camera until I was able to capture this sweet moment -- made sweeter because both animals are sharp.
The next wildlife babies workshop I conduct will be in June, 2014, again in Minnesota. Contact me for details or use this link to go to the promo page on my website that provides all the information you need. It's a phenomenal opportunity to get great wildlife images.