Built-in metal contacts are made of metal with a robust and durable surface coating. The autofocus supports the camera's TTL functions and AE mode for Fujifilm GFX mount. For close-up shots of flowers, you can see the water droplets falling from the flowers using the built-in AF extension tubes. When capturing insects up close, even the tiny legs and transparent wings can be clearly focused. The lens extends to the next subject, then you slowly pull back until the image is sharp, and then return to the normal shooting distance.