Godox Mounting Ring for MF12 Macro Flash

The Godox Mounting Ring for MF12 Macro Flash does not include the threaded adapter rings. Here is the kit for the threaded adapter rings: https://bhpho.to/2Ub7lTB

You would need the 67mm adapter ring provided on the following link to connect your Canon RF 100mm f/2.8 L Macro IS USM Lens to Godox Mounting Ring for MF12 Macro Flash. Godox Adapter Ring Kit for MF12 Macro Flash BH #GOARRKIT • MFR #AR-R KIT https://www.bhphotovideo.com/c/product/1652524-REG/godox_ar_r_kit_adapter_ring_kit_for.html

Unfortunately, I am not sure what the "macro 100" is which you refer to in your inquiry. The Godox Mounting Ring for MF12 Macro Flash is a replacement mounting ring included with the purchase of the Godox MF12 Macro Flash 2-Light Kit, B&H # GOMF12K2 • MFR # MF12-K2. The MF12 Adapter Ring would need the Godox Adapter Ring Kit for MF12 Macro Flash, B&H # GOARRKIT, to connect to the filter threads on the front of a particular lens. The above adapter ring kit includes filter adapter rings for 49, 52, 55, 58, 62, 67, 72, and 77mm lenses. If you have a macro lens with one of the aforementioned filter threads, then the above adapter ring kit would be compatible for use with your lens.

Unfortunately it won't work because the Venus Optics Laowa 25mm doesn't accept regular filters in the front.

With the Godox Adapter Ring Kit for MF12 Macro Flash, the Godox Mounting Ring for MF12 Macro Flash is compatible with any lenses with front filter threads of 49, 52, 55, 58, 62, 67, 72, and 77mm.