Viltrox Canon EF to FujiFilm X Mount Adapter Review

Canon EF to FujiFilm X Mount Adapter

Viltrox has introduced the EF-FX1, a Canon EF / EF-S to FujiFilm X Mount lens adapter that allows autofocus Canon lenses to…use guessed it…mount and autofocus on FujiFilm cameras with the X Mount (all of their APS-C interchangeable lens mirrorless cameras). At ~$160 USD, it’s not cheap, but opens up another huge world of lenses for Fuji fanatics. 

Viltrox EF-FX1: What’s In the Box

The packaging for the Viltrox EF-FX1 is surprisingly nice. The box is a sturdy two-piece slide-apart that has a cutout interior that precisely fits the adapter. It reminds me of a nice watch box, actually. The typical paperwork is inside, along with the expected desiccant pack. Front and back caps are included.

Viltrox EF-FX1: Overall Build Quality & Fit / Finish

I was hoping for a very robust, mostly metal adapter, and I was not not disappointed. The Viltrox EF-FX1 thing is built very nicely, from the metal lens mounts to the smooth exterior finish.

Canon EF lenses mount very snugly to the exterior mount ring, and the adapter itself fits “like a glove” on Fuji camera bodies. There’s no wiggle or jiggle anywhere. That’s a good thing.

Autofocus and Image Stabilization Performance

I’m thrilled to report that autofocus performance is actually quite good. It’s not as good as either a native Fujinon lens or the same Canon lens on a Canon body, but for adapted glass it’s quite respectable. I find AF-S focusing mode is better because lenses tend to “hunt” a lot more in AF-C. This is less of an issue in bright lighting conditions, but still present.

Viltrox EF-FX1 Canon EF to Fuji X Mount Adapter

There is no glass element in this adapter, so there’s nothing in between the adapted lens and the camera’s sensor that can negatively impact image quality. There are full electronic contacts on both sides of the adapter, so aperture can be controlled electronically by the camera and the f/stop value and focal length will be passed back to the camera for EXIF.

Canon’s excellent IS system also works quite well with the Viltrox EF-FX1. The motion-damping effects are easily visually noticeable in the EVF or LCD screen, and I listened closely to verify that the IS gyros were indeed being activated during focusing. Having IS work really makes the purchase of this adapter easier to justify, as many of Canon’s lenses have IS built in.

Image Stabilization Notes

On Canon lenses with IS, the IS gyros are activated when either the shutter button is pressed half way or the Instant AF (AF On or “back-button focus”) button is pushed. On a native Canon body, the gyros stay active as long as the shutter or AF On button stay depressed. However, the same lenses adapted via the EF-FX1 keeps the IS on only for the set duration that the exposure info is displayed after shutter/Instant AF (about 4-5 seconds), even if you keep those buttons depressed. So you’ll have to reactivate the IS periodically. Mildly annoying, but not a huge problem.

One other thing to note is that the camera’s Image Stabilization settings (from the shooting menu) have no effect on adapted lens behavior. The only behavior you can get from adapted Canon lenses is “When Shooting”; the “Continuous” setting does not work.

Tested Cameras and Lenses

I used the following FujiFilm bodies and Canon lenses to test this Canon EF to FujiFilm X Mount adapter:


Lenses (and test notes):

  • Canon EF 28mm f/2.8 IS
    • Note: Tested fine for AF and IS on X-E2, X-E3, X-T100 and XT-2.
  • Canon EF 35mm f/2 IS
    • Note: Tested fine for AF and IS on X-E2, X-E3, X-T100 and XT-2.
  • Canon EF 70-200mm f/4L IS
    • Note: Tested fine for AF and IS on X-E2, X-E3, X-T100 and XT-2.
  • Canon EF-S 18-55mm f/3.5-5.6 IS STM
    • Note: Tested fine for AF and IS on X-E2, X-E3, and X-T2.
  • Canon EF-S 10-18mm f/4.5-5.6 IS STM  << Just added
    • Note: Could not get this one to autofocus on either X-E3 or X-T2. But as you can see in the full list of compatible lenses below, the EF-S 10-18mm is not specified. Perhaps a future firmware update will add compatibility.
  • Canon EF-S 55-250mm f/3.5-5.6 IS STM
    • Note: As tested on my X-E2, the camera would allow me set the aperture wider than the stated maximum (down to f/2). This didn’t seem to actually have a negative effect on the exposure, but it does pass the wrong info to the EXIF data.  AF was mostly good, with the occasional full-on failure to lock focus. Otherwise, this lens works quite well with the adapter, including the IS. >> UPDATE: I updated the firmware on the adapter, and now the proper aperture values are able to be set by the camera and are written to EXIF data.
  • Yongnuo 50mm f/1.8 II
    • Note: As tested on my X-E2, the camera would not allow me set the aperture to the maximum of f/1.8. The lowest it would go is f/2.8 on the display. However, the lens was still open at max aperture when the camera said f/2.8. Kind of annoying, but it at least it works. Autofocus performance, however, is beyond dreadful: For any focus attempt, it fully racks from infinity to minimum distance at least once and often fails to focus correct, even though the camera shows focus confirmation. I do not recommend this lens for adapted use unless you plan to manually focus exclusively.

Overview and Recommendations

Overall, I am beyond pleased with the performance of the Viltrox EF-FX1 Canon EF to FujiFilm X Mount Adapter. It’s well made, reasonably priced, and delivers on its marketing promises.

Who Should Buy This Adapter?

If you already have nice Canon lenses and at least one FujiFilm body, it’s an easy buying decision: just get it. Fuji owners who want to dabble in the Canon lens world may be interested as well. And Canon system owners who are Fuji-curious may want to get this adapter and a cheaper, older Fuji body (such as the excellent X-E2 I used in this review) to see if they can get along with Fuji’s interface and ergonomics.

List of Lenses That Viltrox Says Are Compatible

Here’s the full list of Canon lenses that Viltrox says will work with the EF-FX1 Canon EF to FujiFilm X Mount Adapter:

  • Canon EF 11-24mm F4.0L USM
  • Canon EF 16-35mm f2.8L II
  • Canon EF 16-35mm f2.8 L III USM
  • Canon EF 16-35mm f4.0 L IS USM
  • Canon EF 17-40mm f4
  • Canon EF 20-35mm f2.8 L
  • Canon EF 20-35mm f3.5-4.5 USM*
  • Canon EF 24-70mm f4L IS USM
  • Canon EF 24-70mm f2.8L II USM
  • Canon EF 24-105mm f4L IS
  • Canon EF 24-85mm f3.5-4.5 USM*
  • Canon EF 24-105mm f3.5-4.5*
  • Canon EF 28-80mm f3.5-5.6 II*
  • Canon EF 28-135mm f3.5-5.6 IS *
  • Canon EF 70-200mm f2.8L IS II USM
  • Canon EF 70-200mm f4L
  • Canon EF 70-300mm f4-5.6 IS USM*
  • Canon EF 70-300mm f4.5-5.6 DO IS USM*
  • Canon EF 70-200mm f4L IS USM
  • Canon EF 70-300mm f4-5.6L IS USM*
  • Canon EF-S 10-22mm f3.5-4.5 USM*
  • Canon EF-S 15-85mm f3.5-5.6 IS USM*
  • Canon EF-S 18-200mm f3.5-5.6 IS*
  • Canon EF-S 18-55mm f3.5-5.6 IS STM*
  • Canon EF-S 18-135mm f3.5-5.6 IS STM*
  • Canon EF 14mm f/2.8 L
  • Canon EF 24mm f1.4L II USM
  • Canon EF 24mm f2.8
  • Canon EF 24mm f1.4L
  • Canon EF 28mm f1.8
  • Canon EF 35mm f1.4L
  • Canon EF 35mm f2.0L
  • Canon EF 40mm f2.8 STM
  • Canon EF 50mm f1.8 II
  • Canon EF 50mm f1.4 USM
  • Canon EF 50mm f1.2L USM
  • Canon EF 50mm f2.5
  • Canon EF 50mm f1.8 STM
  • Canon EF-S 60mm f2.8 USM
  • Canon EF 85mm f1.8 USM
  • Canon EF 85mm f1.2L II USM
  • Canon EF 100mm f/2.0
  • Canon EF 100mm f/2.8 Macro
  • Canon EF 135mm f/2.0L
  • Canon EF 180mm f/3.5 L
  • Canon MACRO EF 180mm f/3.5L
  • Canon EF 200mm f2.8L
  • Canon EF 300mm f4L IS
  • Canon EF 400mm f4.0 DO IS USM
  • Canon EF 400mm f5.6L
  • Canon EF 500mm f4L IS USM
  • TAMRON SP 15-30mm f2.8Di USD
  • Tamron AF 17-50mm f2.8 Di-II LD
  • Tamron 18-270MM F3.5-6.3 *
  • Tamron SP24-70mm f2.8 Di- VC USD G2
  • Tamron SP24-70mm f2.8 Di- USD A007
  • Tamron SP28-75mm f2.8 MACRO
  • TAMRON 28-300mm f3.5-6.3 Di VC PZD*
  • TAMRON SP 70-300mm f4-5.6 Di VC *
  • TAMRON SP100-400mm f4-6.3 Di VC USD*
  • Tamron 150-600mm f5-6.3*
  • TAMRON 45mm f1.8 DI VC USD
  • TAMRON SP 85mm f1.8 Di VC USD
  • Tamron SP35MM F1.8 DI VC USD
  • SIGMA 10-20mm f3.5 DC HSM
  • SIGMA 10-20mm f4-5.6 HSM *
  • SIGMA 18-35mm f1.8 DC
  • SIGMA 24-35mm f2 DG
  • SIGMA 24-70mm f2.8 DG
  • SIGMA 50-150mm f2.8 APO DC HSM
  • SIGMA 70-300mm f4-5.6 DG*
  • SIGMA 120-300mm f2.8 DG
  • SIGMA 24mm f1.4 DG
  • SIGMA 35mm f1.4 DG
  • SIGMA 85mm f1.4 DG
  • YN EF 50mm f1.8
  • YN EF 14mm f2.8
  • YN EF 35mm f2.0
  • YN EF 100mm f2.0
  • YN EF50mm f1.4