Viltrox Speedbooster at Canon M6 Mark II electronic issues

Hi everybody,

i use a Canon EOS M6 MarkII with the Viltrox Speedbooster, that counteracts the 1.6 crop of the cam by a factor of 0.71 which is great for EF lenses > 24 mm.

Short facts, then my issue:

This Adapter has some electronics inside which hook up to the communication between camera and lens in order to convert e.g. the aperture value of a 2.8 lens to 2.0 for the camera to display this and write it to the metadata. And that's fine.

Along with that it converts the focal length by it's own 0.71 factor. But this is not the truth for later reviews, as it doesn't consider the camera's crop factor of 1.6

So always keep in mind that the metadata is only party correct.

Now i found two issues with this adapter, that i want to discuss here:

First the power consumption of this thing is really high, as it drains the battery over night completely. That leads me to the question, why the camera still powers the connectors to the lens when switched off ?

The second issue is more tricky and has a lead to the first one:

After a longer period of time (still analysing the conditions) the electronics in the adapter quit working correctely.

I cannot adjust the aperture from 2.8 of my lens down to 2.0 anymore. Turning the wheel changes aperture on the LCD of the cam and inside the lens, but not down to the value of 2.0 as it does before with the same charged battery installed.

To fix this, i disconnect the adapter from the camera and connect it again. It then works as intended.

The interesting thing with this is, that the battery lasts a lot longer, when the adapter is in this failure state.

After my "reset" the adapter works again and the battery was drained just a few hours later with the cam lying around switched off.

So my assumption is, that either the adapter hangs or it puts itself into some suspend mode, because it need less power when in this mode.

Unfortunately the firmware version of the adapter always says 1.4. No matter if it's the 1.2 or the 1.4

Any hints to this phenomenon are welcome!