I'm currently going thru all the twists & turns of Sigma EM 140 v Canon MR 14EX ring flash
The sigma comes with 55 & 58mm adapters which I'm thinking will fit my Tammy 90mm macro
in the canon specs, it doesn't give sizes only what "canon" macro lenses it will fit
Does anybody know if the canon ringflash will fit a Tamron 90mm macro lens or are additional adapter/s required

Thanks
Bryan