Canon Extension Tube EF 25 II

No, the EF 25 II maintains full electronic contact, so autofocus will continue to function.

It is designed for EF, EF-S, and TS-E lenses. It is highly recommended to use it with lenses 50mm or greater for optimal performance.

Because the tube contains no optical glass, it does not introduce any distortion or loss of sharpness to your original lens.

Typically, no. Since the TTL metering system remains functional, the camera will automatically adjust for the light loss inherent in macro extension.

The EF 25 II provides 25mm of extension compared to the 12mm offered by the EF 12 II, resulting in higher magnification at the same focal length.

Ensure the extension tube is securely clicked into place on both the camera body and the lens, and check that the electronic contact pins are clean.

Macro photography often requires very precise focusing. Switch to manual focus and use your camera's live view magnification to confirm the focus point.