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Should you buy the Viltrox Speed Booster 0.71X EF-R3 for the Canon R/ R5/R6 and RP?

Updated: Aug 16, 2022

Viltrox has launched the EF-R3 Speed Booster adapter giving a unique feature to the Canon EOS R line and RP, while recording 4k UHD video.






As you may be aware, these very capable cameras have a 1,7x crop (1.6x on the RP) when shooting video at that resolution, getting final footage like a Super 35 format. Quoting Canon, that’s due to “technical limitations of the sensor and the image processor”.



Source: Canon USA, Inc.


This situation implies that a 50mm becomes a 75mm. So we lose a valuable portion of the available frame due to that. That’s why Viltrox created this adapter, which helps surpassing it.


But first of all, what’s a speed booster adapter?


These very handy adapters work as an opposite of a teleconverter. So instead of magnifying the image by the lens, this one reduces 0,7X the focal length by inverting it. Since the F-number is the focal length divided by the width of the entrance pupil, by maintaining this last one the focal will increase the F-number. That’s why we get an extra stop of light. widen the field of view and by scaling up the image there’s a chance of getting a sharper image or footage.




That way we can transform an f/2.8 in f/2.0 or an f/1.8 in an f/1.2, and get a wider image from the sensor at use while shooting in 4k UHD.

Note that despite being created for the Canon video cameras like the EOS C70 or the Red Komodo, the Viltrox R3 supports full dual-pixel, IS lens stabilization, and electronic aperture control. It also enables EXIF info transmission and provides a USB port for firmware upgrades.




Source: Viltrox



So you maintain all the features of your lens decreasing the 1.74x to 1.24x, getting the field of view of 50mm to a more useable 62mm. Those are good news for sure.


The construction remains like other Viltrox products. It’s well built, has no play when installed and in our tests the performance was flawless. Just remind that this speed booster gets its best performance on 4k and it’s not useable while shooting stills because there we are using the entire portion of the full-frame sensor.





In our tests it’s clear that we didn’t lose any of the features of the Canon EF 16-35 L f/4 IS lens while paired with the Viltrox EF-R3. There wasn’t any apparent video quality degradation or vignette, despite using a wide-angle lens at 16mm and even at its widest aperture of f/2.8.






For the price, we think that definitely, this is a wise choice if you need (and should) make the most of the 4k capabilities of the Canon R. Even more now that the camera prices of the R5/6 are skyrocketing, and there’s plenty of Canon R and RP on the market at great deals.

Also, in our opinion, using the EF lenses is still the best choice, because once again the price of the RF mount is still quite steep price-wise. The extra image quality you could get by using these new lenses is too low for the financial effort you need to do.


So, if you have a good array of EF lenses, a Canon RF mount camera and want more flexibility while shooting video, the Viltrox EF-R3 is a balanced alternative. It's a no-brainer for us.



Also, in our opinion, using the EF lenses is still the best choice, because once again the price of the RF mount is still quite steep price-wise. The extra image quality you could get by using these new lenses is too low for the financial effort you need to do. So if you have a good array of EF lenses, a Canon RF mount camera and want more flexibility while shooting video, the Viltrox EF-R3 is a really balanced alternative. So, we give a solid 4,5 to the Viltrox EF-R3 adapter. See our video review also on our Photo Reflections Youtube Channel.




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