This rather generically marked Olympus converter has one of the larger image circles of any TC tested. The edges are not very good but for portraits, it may be OK. One very nice aspect is that it has a matching 46mm thread, so there's no need for a step-up ring - although instead of threading on, it has clamps that allow for speedy attachment but are not quite as firm an attachment as real threads.

Being able to attach directly to a 46mm thread, this TC is also rather small compared to most of the others tested.