The LEE100 Tandem Adaptor allows two LEE100 holders to be joined together and rotated independently from each other. This is a totally unique feature of the LEE system; no other filter system on the market can do this.
The adaptor slides into the front slot of the first holder and then the second holder clips onto the adaptor in the same way it would to a LEE100 adaptor ring. Joining two holders together allows photographers to independently rotate each holder, meaning you can have two ND grad filters positioned at two different angles.
The LEE100 Tandem Adaptor is ideal for:
Landscape photographers who need ND grad filters positioned at different angles. For example, if you had bright side light on one side of an image you would need to position one ND grad filter vertically to hold back the brightness. Whilst another ND grad filter would need to be positioned horizontally to hold back the detail in the remainder of the sky.
Fashion / portrait photographers can also use the technique of having ND grad filters at different angles. An example being ND grad filters positioned either side of a models face, for a darker moody looking image.