For Tamron 15-30mm Di VC USD G2, For Tamron 15-30mm Di VC USD or Di USD, For Pentax HD D FA 15-30mm f/2.8 ED SDM, Holds Filters 150mm Wide, 2mm Thick, Holds up to 2 Rectangular Filters, Holds 2 Rectangular & Magnetic Filters, Filter Holder Rotates 360°, Durable, Lightweight Construction, Easy Installation. This M15 Filter Holder Kit is designed for use with a Tamron SP 15-30mm f/2.8 Di VC USD G2 lens a Tamron SP 15-30mm f/2.8 Di VC or non-VC USD lens or a Pentax HD D FA 15-30mm f/2.8 ED SDM WR lens. It allows for the convenient use of up to two separately available 150mm wide 2mm thick filters along with a separately available Haida Magnetic Filter for the Haida M15 Filter Holder. Mounted within a nonthreaded aluminum alloy ring a Haida Magnetic Filter for the Haida M15 Filter Holder is made specifically to fit between the included Haida M15 Filter Holder and an adapter ring for the filter holder. For filters such as a Haida Magnetic Circular Polarizer the filter holder's external dial integrates with the filter ring allowing for the independent rotation and adjustment of those filter types. Pre-installed with one pair of plastic filter slots the aluminum alloy filter holder is initially configured to accommodate one rectangular filter. Use of the Haida M15 Filter Holder is easily accomplished by placing the kit's adapter ring over the integrated hood of a Tamron SP 15-30mm f/2.8 Di VC USD G2 lens a Tamron SP 15-30mm f/2.8 Di VC or non-VC USD lens or a Pentax HD D FA 15-30mm f/2.8 ED SDM WR lens followed by an optional Haida Magnetic Filter for the Haida M15 Filter Holder. After being fitted onto an adapter ring the filter holder's pull-and-release locking knob helps to provide a reliable yet adjustable connection that allows the holder to be rotated 360? which benefits the use of rectangular graduated neutral density or other filters that are enhanced by varied positioning.