Hi Folks... Finally got enough money saved to buy a Canon MT-24EX Macro Twin Lite Ring-lite Flash though a little confused as by searching and reading up I cannot find anywhere that tells me if it will need an adaptor I have seen where you have to get one for the 180mm macro lens as it has a 77mm filter thread but nothing about the Canon 100mm L IS lens which has a 67mm filter thread. The other Canon 100mm non IS macro lens has a 58mm filter thread which I assume the flash fits that one OK.

So if anyone can help me here I would appreciate it..

Is this twin flash compatible with the Tamron 90 mm macro lens which has a 55mm filter thread, I suppose I will probably need another adaptor if it is..