30. BUTTONS AND SWITCHES
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, ...