*【Manual Focus】Manual focus is achieved without electronic contacts. By using this mount adapter, focus and aperture adjustment can be done manually. (Attention: When using, please set “Menu” -> “Setup” -> “Release w/o Lens” -> “Enable”. The Lensless Release setting may vary depending on the camera model. Please refer to the manual of each camera and make the settings.) A notice: “No Lens Attached” warning message appears: The position of the infinity mark [∞] of the telephoto lens is slightly shifted to the positive side to allow focus adjustment even if focus shift is caused by temperature changes. The displacement range is marked by an L-shaped line. Be sure to check focus through the viewfinder, even when shooting at infinity. Adapting a full frame lens to an APS frame camera provides.