I was browsing ebay and came across an Olympus 1.45x TC with 46mm mount diameter. Offered the guy $8 best offer and he took it. There were several more under $20 shipped. Figured it would be fun to test on my 45mm and 60mm to see what it can do as a longer fast prime option. With the 46mm threads it would fit on a lot of m4/3 lenses. I have pretty high hopes for this one because it has a very large diameter front element and the rear element is larger than the 45mm and 60mm. It is very light (plastic body) and not only are the rear mount for 46mm filter threads, it's spring loaded for easy mounting. My research indicates that it was originally designed for the Olympus Centurion, which was a "bridge" camera in the mid 90s that used APS film (1.25x crop) and had a 35-125mm equivalent zoom range. So it was designed for a large "sensor". Here's a picture of it on the 45mm (with a 37-46 step ring) next to the 60mm macro for size comparison. It is a very reasonable size. here is is on the 60mm macro as well as a picture of the box. It is long, but light and not unreasonable. The filter comes off instantly with the quick release: Here you can see the diameter of the elements. Larger than the lenses I plan to try it on: I don't have a 52-46mm step down ring, but the rear element is larger than the front element on the 45-150mm, so I may try it on that lens, too, if it tests well on the 60mm. So far the only conclusive test I have done is that it has ZERO light loss! In all my tests, I get the exact same exposure with or without the TC on both the 45 and 60mm. I tried some sharpness tests, but they were not controlled very well so I will not post them. I will try again tomorrow, but I can at least say it appears very usable and has no noticeable vignetting issues. I will update this over the next few days with pictures taken with the converter.