How to Use the Canon 67C Macrolite Adapter

By Harrison Cameras | Published: 2026-10-22

Category: How-to Guides

Learn how to attach the Canon 67C Macrolite Adapter to your lens for macro flash photography, including step-by-step instructions and common mistakes to avoid.

Quick Answer

To use the Canon 67C Macrolite Adapter, simply screw it onto any lens with a 67mm filter thread, then attach your compatible macro flash (ML-3, MR-14EX, or MT-24EX) and start shooting.

Why Use a Macrolite Adapter?

Macro photography often requires precise lighting, and a dedicated macro flash like the Canon ML-3, MR-14EX, or MT-24EX can make a huge difference. The Canon 67C Macrolite Adapter bridges the gap between these flashes and lenses that have a 67mm filter thread, such as the Canon EF 100mm f/2.8L IS USM Macro Lens.

Without the adapter, you'd need a lens with a built-in mount for these flashes, which limits your options. The adapter gives you flexibility and lets you use your preferred macro lens with a ring flash or twin flash setup.

Compatibility Check

Before purchasing, verify that your lens has a 67mm filter thread. Most macro lenses in Canon's lineup, including the popular EF 100mm f/2.8L IS USM, have this thread size. If your lens has a different filter thread, the 67C adapter won't fit directly—you may need a step-up or step-down ring, though that can affect stability.

Also, confirm that your macro flash model is compatible. The adapter works with the ML-3, MR-14EX, and MT-24EX, but not with other flash units.

Step-by-Step: Attaching the Adapter

Check your lens filter thread: Look at the front of your lens for the filter thread size (e.g., Ø67mm). If it's not 67mm, the adapter won't fit directly. If unsure, check your lens manual or the printed marking on the lens barrel.
Align the adapter with the lens: Hold the adapter so its threads align with the lens's filter threads. Gently screw it on clockwise until it's snug, but avoid overtightening. Overtightening can make removal difficult and could damage the threads.
Attach the macro flash: Mount your compatible macro flash (ML-3, MR-14EX, or MT-24EX) onto the adapter according to the flash's instructions. Ensure it locks securely. A loose flash can shift during shooting, causing uneven lighting.
Test the setup: Take a test shot to confirm the flash fires correctly and the adapter doesn't cause vignetting. Adjust the flash position if needed. Vignetting can occur if the adapter is not fully seated or if the flash is misaligned.

Product Facts

Canon 67C Macrolite Adapter: The Canon 67C Macrolite Adapter attaches the ML-3, MR-14EX, or MT-24EX macro flashes to most lenses with a 67mm filter thread, including the Canon EF 100mm f/2.8L IS USM Macro Lens. This means you can use a dedicated macro flash with a wide range of lenses, giving you more creative control over lighting in close-up shots.
Canon 67C Macrolite Adapter