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Firmware update for Meike EF-RF Control Ring Adapter



I bought the Meike EF-RF Control ring adapter. It works very well with my Canon EF lenses, but I have a slight issue with the focus of my Tamron 24-70 f/2.8 G1 at 24mm when focusing to infinity (my EOS R8 cannot focus and even in MF, I can't find any focus)

I thought of a lens issue, but it works perfectly with my 6D, and it also works on the R8 with the Canon EF-RF adapter.

I browsed Meike's website but could not find the firmware update for the control ring adapter, has anyone found it?



Use the official Canon EF-RF Mount adapter. 3rd Party Mount adapters are causing all kinds of problems with cameras. Your lens may use what is called "Focus By Wire". The lens uses the AF Motor for manual focus to work. Which requires the lens and the camera to communicate.


Current Gear: EOS 5D Mark IV, EF Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D & Sigma 17-50mm F/2.8 EX DC OS HSM


Meike firmware for the MK-EFTR-B.  I know where it is, but good luck trying to figure out how to install it.  No instructions are included.  Its..  dub dub dub dot mkgrip dot com forwardslash down dot html

For your R8, I'd follow Demetrius' suggestion.  Stick with the Canon adapter(s).  There is no reason to go Meike unless you need drop in filters or dial adjustable ND (MK-EFTR-C)


Bay Area - CA

~R5 C ( ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10

~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It


I had the same problem with my Tamron 18-400 f/3.5-6.3. I was able to solve the problem by simply updating the firmware of my EOS R10, not sure why this fixed the issue though...
I tried and tried to update the firmware on the adapter but it simply is not picket up by the computer. Not sure if this helps, but it worked for me and if you have an available firmware update for your camera it might just work!