K&F Concept M42 to EOS R Lens Mount Adapter, Manaul Adapter for and Canon Camera

Lens mount adapter compatible with M42 lens to Canon EOS R Mount SLR Cameras; infinity focus or beyond guaranteed High-quality copper and aluminum alloy ;High precision and durable. Red dot mark, accurate alignment, Install and remove smoothly. Manual Focus: Full manual control, Diaphragm control of the lens is set manually. Supports manual control, manual focus, manual exposure and focus to infinity; First Use: Enable the setting of your camera as "release shutter without lens" when first use with a manual adapter, otherwise the camera will not recognize your lens and cannot take pictures. Please note: Infinity focus position：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, Be sure to check the focus through the viewfinder even when you shoot at infinity.