LENSES ARE FEATURING more buttons and switches than ever before. This can enable you to further customize your interactions with the lens. There is a wide range of options that may or may not be available depending on the specific lens and its intended purpose. Some lenses have nothing more than a focus ring, while others may feature as many as a dozen buttons and switches. Generally speaking, longer telephoto lenses and more expensive lenses may have a number of the following features.

The Simple Features

The most basic control on a lens is the focus ring. It’s pretty obvious in its operation, but as an interesting note, ...

Get 50 Things Photographers Need to Know About Focus now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.