Hey Jon,


This is from the B&H website:


&bull; Attaches EF 50mm f/2.5 Compact Macro, <span style="background-color: #ffff00;"]EF 100mm f/2.8L Macro IS (requires Macrolite Adapter CMLA67 (not included)), EF 100mm Macro f/2.8 USM, and MP-E 65mm Macrophoto Lenses [without filters attached] (can also be used with EF 180mm f/3.5L Macro USM via Macrolite Adapter 72C)
Can be adapted to other popular filter sizes with appropriate Macrolite Adapters; 52mm, 58mm &amp; 72mm