Acuity Indicator (Type 7A9)

The Putora acuity indicator is the most advanced and accurate test chart. Any photographer will be able to accurately evaluate the sharpness and resolution of all types of film, video and camera.
The sharpness indicator consists of test targets with concentric circles printed on the background at the level of the reference field. The background has the same reflectivity as the average reflectivity of the targets. When the target appears to blend into the background, the table shows that the target is out of focus of the system under test.