Compatibility and Performance: The adapter fits perfectly on my EOS R6, and attaching my old EF lenses was a breeze. It was a delight to be able to use these lenses on my newer camera. The auto-focus functionality with my EF lenses worked well, which I was concerned about initially. This seamless integration has significantly enhanced the versatility of my camera setup.

Build Quality: The adapter feels well-crafted, made of what seems to be high-quality metal. The plastic caps also exhibit a good build quality, adding to the overall sturdy feel of the product.

Ease of Use: Both attaching the adapter to the camera and the lenses to the adapter were straightforward processes. I encountered no difficulties in handling or operation.

Mystery Foam Cutout: Upon unboxing, I noticed a foam square cutout that was empty. While it didn't seem like anything was missing, the purpose of this cutout remains unclear. It's a minor detail and doesn't impact the functionality of the adapter but I am curious If I am missing something from the package.

Overall Satisfaction: I am very pleased with the K&F Concept EF to EOS R Adapter. Its ability to bring new life to my EF lenses on an EOS R camera is great!