Our adapters support to focus to infinity. Since it's a manual adapter, if you come with this issue, please try to set the camera as MF (manual foucus) mode, then turn the focus ring to the infinity (∞). And please try to turn back a little to achieve focus to infinity in case the infinity mark of some lenses is not accurate enough.
Besides, the position of the infinity mark [∞] of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes. The shift range is denoted by an L-shaped line, please be sure to check the focus through the viewfinder even when you shoot at infinity.