The final piece that attaches to the front of the Relay Lens is the Objective Lens. There are three different versions with varying degrees of angle-of-view. You would choose one based on the look, subject or type of image you would like to produce. These, like the other two parts, can all be put together and disassembled underwater. You could keep all three objective lenses with you and swap out when needed. You can shoot these just like you would any other lens, but the real magic happens when you get up close to your subject. All three objective lenses will focus as close as the front element with the correct setting. You could fill up most of the frame with a nudibranch and still have room for a diver in the background! The EMWL is a great tool to boost your creativity.

More information about the EMWL system is explained in this blog post.

You need to combine this part with a Relay Lens and a Focusing Unit!