The Lee Seven5 Neutral Density 0.3 Standard Filter is designed to reduce the amount of light reaching the sensor by 1 stop, without affecting the overall colour balance. The reduction of light across the entire frame allows the use of slower shutter speeds to record the movement of objects, such as water, clouds, people, cars etc. ND filters can be stacked together, or used with other filters, so you can respond to almost any lighting condition. The Lee Seven5 Neutral Density 0.3 is 75x90mm in size and made to fit the Lee Seven5 filter holder. In order to use this filter you will need to purchase the correct size Seven5 adapter ring for your lens (check your lens for thread size) and the Seven5 filter holder, both of which are available separately.