The Chrosziel 110 to 100mm Insert Ring is used when the outside diameter of a professional camera lens is 100mm, and the user needs an insert ring to adapt the Chrosziel 4x4" 110mm matte box's opening. The ring rests inside the matte box and quickly flips to accommodate the smaller lens.
110 to 100mm insert ring
Designed for Chrosziel's 4x4" matte boxes