Macrolite adapters are rings used to attach Macrolites to select lenses.
The come in different sizes depending on the lens filter thread. Make sure to check the adapter is compatible with your lens.
Adapter 52C: Attaches Canon ML-3 or MR-14EX flashes to most 52mm filter sized lenses.
Adapter 58C: Attaches Canon ML-3 or MR-14EX flashes to most 58mm filter sized lenses.
Adapter 67: Attaches Canon MT-24EX, MR-14EX or ML-3 flashes to most 67mm filter sized lenses.
Adapter 72C: Attaches Canon ML-3, MR-14EX or MT-24EX flashes to most 72 mm filter sized lenses.