The Cokin H3H0-25 set includes the Cokin P BP-400 handle and 3 filters: P121L - half gray ND2, P121M - half gray ND4 and P121S - half gray ND8. Cokin filters are mounted using a holder (holder), which is attached to replaceable mounting adapters, with diameters that can be adapted to your lens. The P system is recommended for compact system cameras with interchangeable optics (mirrorless) and amateur SLRs with APS-C matrixes used with kit or long focal length lenses. It can also be used with small video cameras. In order for the set to be fully functional, you should also purchase a Cokin P ring (adapter) with the appropriate diameter.