This 0.71x Lens Mount Adapter from Viltrox allows a full-frame Canon EF-mount lens to be mounted onto a Canon EF-M-mount camera. While doing so, the adapter's optics help to maximize the connected lens's apparent angle of view while providing a one-stop increase for the camera over the lens's aperture range.

If a lens intended for 35mm film or similarly-sized full-frame camera sensors is connected to a Canon EF-M-mount camera, it would project an image larger than the camera's APS-C sized sensor was built to accept. Able to capture only the center portion of the projected image, the effective angle of view of the lens would be narrowed, creating an in-camera "crop factor." This adapter condenses the light from a lens designed for 35mm film or "full frame" camera sensors and projects it onto a Canon EF-M-mount camera's APS-C sensor. This allows the APS-C sensor to utilize more of the light gathered by a connected lens, which effectively reduces the crop factor while making available to the sensor an additional one stop of light for each of the lens's f/stop settings.

If a compatible lens includes autofocus, as well as camera-controlled aperture functions, this adapter is intended to allow those features to be used. Also, if an attached lens is capable of generating Exif metadata when used with a directly compatible camera, this adapter is designed to allow that information to be saved along with image files generated with a combination of the lens, a compatible Canon EF-M-mount camera, and the adapter.

This adapter is constructed with four lens elements in four groups that are designed to provide optical clarity as well as color fidelity, and the underside of its detachable tripod foot is tapped with a 1/4"-20 accessory thread, enabling direct attachment to tripods or quick release plates that feature 1/4"-20 mounts. For ease of upgrading its firmware, this adapter also includes a micro-USB port.

Canon EF-Mount Lens to Canon EF-M-Mount Camera

• Maximizes apparent angle of view of combined camera and lens
• Provides a one-stop increase for the camera over the lens's aperture range
• Four lens elements in four groups for optical clarity as well as color fidelity
• Supports electronic communication between camera and lens to enable autofocus, on-camera aperture control, and Exif metadata generation when possible
• Detachable tripod foot with 1/4"-20 accessory thread for direct attachment to tripods or quick release plates that feature 1/4"-20 mounts

Related Questions and Answers

Q: 1. Can this help with the crop effect created by the sigma DC 30mm f1.4 contemporary lens for the canon m50? Will this speedboster be compatible with those lens mounts?

A: The Sigma 30mm is a DC lens so it was made for the crop sensors in the M50. Using a booster would cause vignetting on a Sigma DC lens.

Q: 2. Will this work with the Sony FS7?

A: This adapter is for APS-C/Super35 sensor cameras. Therefore this is intended for cameras like the Sony FS7.

Q: 3. Has anyone has a problem with this installing it on the Black Magic Pocket 4k?...it doesn’t fit on it

A: It is not made for the Black Magic camera. You would need this version instead: https://bhpho.to/2MXlorM

Q: 4. Is this a speed booster

A: Yes. The adapter's optics help to maximize the connected lens's apparent angle of view while providing a one-stop increase for the camera over the lens's aperture range. Speed boosters provide a stop extra of light.

Q: 5. Will this work with EF-S lenses? Like the Sigma 17-50 f/2.8 on Sony ZV-E10?

A: No, the Viltrox EF-E II 0.71x Lens Mount Adapter for Canon EF-Mount adapter is for full frame lens to Sony crops sensor cameras. EF-S lenses are already made for crop bodies.

Q: 6. is this compatible with Sigma 24-105 F/4 Art lens?

A: Yes, the Viltrox EF-EOS M2 0.71x Lens Mount Adapter for Canon EF-Mount Lens to Canon EF-M-Mount Camera is compatible with the Sigma 24-105mm f/4 DG OS HSM Art Lens (Canon EF). This item will help the lens to be mounted on a Canon EF-M camera (eg., Canon M50 MII).

Q: 7. This is for Cannon M-50 camera to EF lens, Right?

A: This adapter allows for Canon EF lenses to be used on EF-M mount cameras like the EOS M50.

Q: 8. If I use a sigma 24 -70mm will it be the exact same and will there be any visible vignetting on the edges of the frame?

A: Since the Sigma 24-70mm f/2.8 DG OS HSM Art Lens for Canon EF is a full-frame lens, when using it with the Viltrox EF-EOS M2 0.71x Lens Mount Adapter for Canon EF-Mount Lens to Canon EF-M-Mount APS-C Camera, it would project an image larger than the camera's APS-C sized sensor was built to accept. Therefore, you will not get any vignetting, and you will get a one-stop increase for the camera over the lens' aperture range.

Q: 9. So do I multiply my EF lens focal length by 0.71? Like a 50mm lens is now a 35.5mm?

A: Yes. The Viltrox EF-FX2 0.71x Lens Mount Adapter for Canon EF-Mount Lens to FUJIFILM X-Mount Camera would convert a 50mm Canon lens to a 35.5mm. Also the aperture would effectively by wider so the 50mm f1.8 becomes a 35.5mm f1.4 lens.

Q: 10. I am confused with the compatibility of this Adapter, In the product Compatibility section EF-S lenses are mentioned. However, in Q&A it is mentioned this adapter is not compatible with EF-S lenses. Please tell me this adapter is compatible with EF-S lenses or not?

A: Unfortunately EF-S lenses are not compatible with Viltrox EF-EOS M2 0.71x Lens Mount Adapter for Canon EF-Mount Lens to Canon EF-M-Mount Camera.