VILTROX EF-M2II 0.71x Speed Booster, EF to Micro 4/3 Focal Reducer Booster Adapter Auto-Focus for GH6 GH5M2 BMPCC 4K GH4 GH5 G100 G95 G85 OM-1 EM-1 E-M1X E-M1 iii E-M5 iii E-M10 iv E-M10 iii
Condition: New
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Availability:
In Stock.
Arrives
Saturday, Mar 21
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Features
- Compatibility: Viltrox EF-M2 II is an upgrade version of EF-M2, allowing Canon EF series lenses to be used on M4/3 cameras, such as GH4 GH5 GF6 GF1 GX1 GX7 GX85 E-M5 E-M10 E-M10II E-PL5
- 0.71x Focal Reducer Converter: focal length is multiplied by 0.71 based on the original (equivalent focal length = focal length x 0.71), which helps enlarge 1 stop aperture
- Material & Design: bayonets are made of metal with surface plating treatment, being durable and sturdy; inbuilt copper electronic contacts and IS function, making focus precise and clear, with 1/4" thread tripod foot at the bottom, etc
- USB Firmware Upgrade: Equipped with USB interface, can realize software upgrade. Can perfect new functions of the lens mount adapter and fix bugs according to follow-up upgrades.
Brand: VILTROX
Focal Length Description: 50 millimeters
Lens Type: Standard
Compatible Mountings: Canon EF
Camera Lens Description: 4
Product Dimensions: 0.79 x 2.64 x 2.64 inches
Item Weight: 9.2 ounces
Item model number: 53003867
Is Discontinued By Manufacturer: No
Date First Available: May 31, 2019
Manufacturer: Shenzhen Jueying Technology Co., Ltd.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Mar 21
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
It’s hard to express just how much I love this speedbooster! Never had a problem with it and works great on my BMPCC 4K.
Reviewed in the United States on January 2, 2026 by Terione
This adapter is incredible for the money. However you will need to rotate the element inside the unit to achieve proper infinity focus. I had to update the firmware for it to work with the pocket 4K. Finally, do not use this adapter past the lenses advertises t stop. For example on the sigma 18/35, this adapter stays sharp all the way to f1.8, but when you use the “boosted” range of f1.2 to f1.8, it becomes a blurry mess. This is where the metabones is better. However it is way more expensive and if you’re happy doing the infinity focus tweak as well as using it within what the lens was designed for, you’re going to be extremely happy. Perfect pairing for the pocket 4K, as dropping the money on the metabones for the pocket 4K puts you at the same price as just getting a pocket 6k anyways.
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Reviewed in the United States on January 26, 2022 by Mark Boucher
Lousy quality. Focus is awful to say the least. I purchased this and put it away as I was shooting aboard for three months. Just got back. Use it and everything is soft. Everything. Had to stop using it within ten minutes. Going to reach out to Amazon and sent this crap back.
Reviewed in the United States on January 24, 2026 by Miko
Mine came as a potentially returned or used unit. Because there's plenty of dust and visible smudge on both sides of the glass. Even though the packaging is still sealed. Either it was used or Viltrox's QC is trash. It was not too hard to get the dust and smudge out. Later, I went and upgraded the firmware. It was quick and without incident. Autofocus was much improved and aperture control from camera is enabled. After that, you need to adjust the infinity by rotating the glass element. My unit is way off. The autofocus is very usable for photography. I've tested 50 F1.4, 24-105 F4, 17-40 F4, 70-200 F2.8, 400 F4, and 100 Macro. They all worked fine. But the AF is completely unusable for video. It will either make loud noises with some lenses, or hunt repeatedly on a stationary subject, or fail to land on a proper focus, or all of the above. So expect to use MF for video shooting. After all, it's great for the price.
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Reviewed in the United States on August 9, 2023 by Kylinblue
Understand that you should update the firmware and set your infinity zoom first so you will be all good. Instructions can be found online and both can be done in 5 mins. This adapter works great with connecting my Sigma 17-50 EF to my BMPCC4K micro 4/3. I get my normal F2.8 down to an F2 and plus a wider frame. Also, keep in mind that the auto focus won’t work with this camera… but I knew that going in and won’t use it anyways. Overall, the adapter does exactly what I need and want it to do at a cheaper cost than its competitors.
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Reviewed in the United States on February 29, 2024 by andy waggoner andy waggoner
Works great!
Reviewed in the United States on January 3, 2026 by Doctorclippsfb
Using this on the BMPCC 4K, not only is the connection to the camera loose, but the connection to EF lenses is too. When I rack focus, there is a noticeable jitter in the image due to the lens shifting back and forth. I have not tested the auto-focus so photo lenses might work better, but I would not recommend this for cine lenses.
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Reviewed in the United States on November 14, 2020 by Evan
When it works, it’s great. I moved from Canon to an OM-1 MkII but I hated to give up my favorite Canon macro lens, the 180mm f/3.5L. I bought this in hope that I could still use it on my new camera, as it was on the list of compatible lenses. I was able to get a couple of shots off before my camera screen went black. I kept having to turn the camera on and off in order to make it work, and sometimes multiple times. Definitely not conducive to an enjoyable shooting experience so I returned it. Side note: I ended up buying a full-frame Canon RP and an EF to R lens adapter which was cheaper than buying an Olympus macro lens!
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Reviewed in the United States on February 1, 2025 by CanonFan