Hi All - just received an Olympus MC-14 (1.4x teleconverter) to use with my M4/3rds lenses and it doesn't fit either of them! I was expecting it to fit the 75-300 as my EC-14 did on my E520 + 70-300. It doesn't fit my 12-50 or 60mm macro either. The lump at the front means it won't fit. This is due to my assumption that it would be a generic T/C, but to me it is just a piece of junk to sell on.