Yongnuo has just released the EF-E II Lens Mount Adapter with autofocus for Canon EF and EF-S lenses to Sony E Mount. It’s equipped with a USB socket for firmware updates, supports both phase and contrast detection autofocus, it supports Canon IS, too. Oh, and it’s only $99.99.

According to the description of the listing which was dded to Amazon (yup, they didn’t even announce it, just put it up for sale)…

allows EF/EF-S series lens or lens to be compatible with E mount Camera.

Equipped with USB interface to improve product performance, supports firmware upgrade and lens data analysis through USB.

2 Focus Systems- With focusing system selection switch, support AF focus system and Mixed-focus system, both focusing systems require camera support for normal use.

Equipped with Fn function keys, it is possible to achieve more practical functions in the future. Please pay attention to the offical announcement from to get the latest information.

With 1/4 inch screw hole at the bottom, can be installed on the tripod or other fixed bracket easily.

One particularly interesting feature of this adapter ring is that it has a function (“Fn”) button, which can be configured to perform various tasks. Or at least, it will in the future. Looking at the manual for the EF-E II adapter, though, it doesn’t appear to do anything yet. It says that functionality will be coming soon, and will require a firmware update, but not what that firmware update will allow users to do.

This is by far the cheapest EF to E mount adapter out there that allows autofocus and full electronic communication. How it’ll stand up to long-standing respected adapters like the Sigma MC-11, though, is another matter. The MC-11 wasn’t always as good as it is today. So, it’ll be interesting to see how well the Yongnuo adapter performs in comparison to where the MC-11 stands today.

If you want to get a Yongnuo EF-E II adapter of your own, then you can buy one now for only $99.99. The listing says they’re in stock, and that you should expect to get it within a couple of weeks. You can find out more about it on the Yongnuo website.