The Metabones Speed Booster XL, or possibly all Metabones adapters at this time, have an issue communicating correctly with the new Panasonic GH5.
Before even using the adapters make sure you’re running the most current firmware. You can download it here. Unfortunately if you’re using a Metabones “S” adapter that doesn’t have the “Green Mode” button this method will not work and you will need to wait for Metabones to release a firmware update.
Quick tip: getting the Metabones working on the GH5
When you mount a lens with the adapter, the GH5 image either freezes or the LCD is black with no image. I tested this with the Sigma 18-35 and the Canon 24-105. Both have the same issue.
Here’s a workaround until updated firmware is available for the GH5: First, turn the camera on without the lens and adapter mounted to the GH5.
This part is a little tricky. You want to put the adapter in “Green Mode” To do this turn the lens slowly. As soon as it clears the top push the toggle button in and continue to hold it down while locking the lens with Speed Booster adapter to the GH5 mount.
Wait until the LCD screen shows an image and release the button.
The iris control won’t work on the GH5. You need to press the toggle switch in on the Speed Booster to get iris control. Now the GH5 and Speed Booster will work with the camera. If you want to use the toggle switch on the adapter push it in and now it’s engaged and will control iris. I don’t know why you would want to do that but it’s an option.
Unfortunately until Metabones releases a firmware update you will have to do this every time you power on/off the GH5 or change lenses.
Is The Metabones Speed Booster XL the Best Fit For The GH5?
Another thing to know is the Metabones Speedbooster XL will vignette with the popular Sigma 18-35 at 18mm. You will need to push in to around 20mm. For me, I think it’s worth having the XL only for its flexibility with full frame lenses. I haven’t tested other APS-C lenses yet, however most will probably have the same vignetting since the XL model is designed for full frame. If you have a lot of APS-C glass then the Speed Booster ULTRA might be a better choice.
What do you think? Worth the $650 for the Metabones Speed Booster XL on the GH5? What lenses do work for you without issues so far?