You need this chart if you take images whether still, video, or film, since the focus is the first essential component whether you have just one plane of focus or multiple planes in a moving camera situation.
This is a pocket-sized Siemens focus chart that "dazels" when your image is in focus. It makes critical focusing easy and is essential for small object photography or motion control where the focus changes and needs to "roll" from one framing to another, If your lens is wide open to maximize bokeh then you need to know where your focus point is and this chart makes it easy and quick.
The chart comes on a credit card which doubles as a white balance chart and it may be punched for hanging on a ring or as you see it here on a "badge clip" so that it can be kept handy on set. As shown it fits in a credit card case along with other credit card-sized charts and slate.
The chart is printed on durable vinyl and should last for years with care and may be wiped clean using soap and water but avoid caustic cleaners like nail polish remover or mineral spirits.
The auction is for one pocket chart.
If you wish your chard pre-punched in the corner please contact the seller after purchase.
The other chars shown and the card case are not included.