With this adjustable filter, you can quickly and easily determine the darkening yourself using an adjustment ring on the filter. There are now no limits to what you can do and you can react perfectly to the environmental influences in fractions of a second. By adjusting the darkening of the filter, the exposure time is automatically extended and you can capture objects much better when taking photos with an open aperture. You can achieve amazing and breathtaking long exposure effects. You will be enthusiastic! Batteries must not be disposed of with household waste. You are legally obliged to return old batteries so that they can be disposed of correctly. You can hand in used batteries at a municipal collection point or at your local store. You also have the option of sending old batteries