In photography, back focus refers to a situation where the point of focus lies behind the intended subject, resulting in a blurry or out-of-focus image. It’s a common issue that can be frustrating for photographers of all levels. Fortunately, there are several methods to check for back focus and correct it if necessary.
One simple way to check for back focus is to use a focus chart or ruler. Place the chart or ruler in front of the camera and focus on it. If the resulting image is sharp, then the camera is correctly focused. If the image is blurry, then the camera is likely back-focusing.