Learn to Use a Manual Lens
No matter how good autofocus is, there are still times when manual focus is the better shooting option. When used in the right scenario, it gives a photographer more control over the photo, and in some cases, achieves effects that aren't otherwise possible in autofocus mode.
Using a manual lens on a DSLR can be a rewarding experience, as it allows for full creative control over your photography. However, it does require practice and a good understanding of exposure settings to achieve the desired results.