On the side of your eyepiece (as shown below) is a small wheel to adjust the focus of your eyepiece in accordance to your vision. You will never know if your subject is in good focus if you can't see what is sharp yourself through the eyepiece. My what? Your diopter - or your eyepiece. This tutorial will give you a better understanding of focus and sharpness, and hopefully help you take photographs that you're very happy with! This is often down to a lack of understanding of how an autofocus (AF) system works. The most common complaints I hear from most photographers of any experience level are "My images aren't sharp" and "I can't get my focus to lock." Most want to blame their equipment and, while there are many instances that equipment is to blame, I have found a vast majority are just simple user error. This tutorial was first published in October, 2009. I am simply pointing out that it can be done, since Apple engineers figured out a way to do it.Twice a month we revisit some of our reader favorite posts from throughout the history of Phototuts+. There have been numerous discussions in different forums about focus points missing from LR, and the argument from LR die-hard supporters is frequently that it's not available in the SDK therefore LR can't do it, or something to that effect. Lightroom is my tool of choice, but Aperture works for a lot of other photographers I know and work with. Many of us in the business use, or at least are familiar with, both Aperture and Lightroom. And your comment about Aperture leads me to believe you have never used it.
Auto-focus design and implementation in the cameras I use is pretty sophisticated these days, and generally performs well in shooting situations where focus is otherwise difficult (manual or automatic).
And "Actually letting the camera choose the focus points is a bad idea" doesn't apply in many areas of photography. So Cletus, it's never " a little late to be seeing where the focus 'should have been' " since we are always trying to get better at what we do. It is also useful to determine what settings apply best to different sports. This can help determine what changes could be made to the camera's focus settings to do it better the next time around. When shooting sports or other fast-moving action sequences, it is very useful to see where (or if) in the scene the camera focused. On a Nikon D3 (and many other cameras) there are multiple menu items related to focus, and more than one setting within many of them.
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