I only have one lens that the MC-14 works on (90mm Macro PRO), but it does a fantastic job. I get insane magnification in S-Macro mode with the lens. Sometimes it's almost too magnified for the size of the subject, but this is a good problem to have. I was also rather surprised that I was able to have success using the macro lens with the MC-14 for birds in flight. The attached pictures are all uncropped.

This works perfectly on my 90 mm macro pro AND my 40 - 150 2.8 pro lenses. I was thrilled to see how much more reach I got with my macro, which allowed me to be even further back from my subject to not block any light but still fill my frame.

This product provides the extra reach for my 50-200 mm lens. It gives me a 560 mm at F4 while retaining sharpness.

I have a OM-1Mark II and the Olympus 100-400mm lens. I take a lot of bird pictures and once in a while I need some extra range. I had my doubts about using an Teleconverter but after reading on-line what others have reported, I went ahead and bought the MC-14 teleconverter and I am very glad that I did. With good light and a steady hand, I am very pleased with the results. I do think that with the teleconverter on, the auto foucus is a bit slower but not enough to bother me.

This works perfectly on my 90 mm macro pro AND my 40 - 150 2.8 pro lenses. I was thrilled to see how much more reach I got with my macro, which allowed me to be even further back from my subject to not block any light but still fill my frame.

I wonder why Olympus hides the fact that the excellent MC-14 also works with the 100-400mm F5.0-6.3? Above on this page it says "Compatible with the M.Zuiko Digital ED 40-150mm F2.8 PRO and M.Zuiko Digital ED 300mm F4.0 IS PRO lenses'. I get fabulous results with the E-M1 Mk III, the 100-400 plus the MC-14, handheld, 1120mm in 35mm equivalence! Weighs only 1.9kg (4.18 lbs)!

This teleconverter works flawlessly with the 40 - 150 PRO lens. Image quality is not visibly effected. It is light and ruggedly built. A no-brainer if you need some extra reach.

If you are going to splash out for the 40-150 PRO Lens you should absolutely extend its range with this teleconverter. It is a useful amount of magnification (from 300-420mm FF equivalent) that can make a big difference in the size of your subject without degrading the image quality. You will only want to use it within that range because of light loss (f/4 instead of f/2.8) but I find myself attaching it frequently to get that much closer to birds in trees or skittish animals. It comes in a padded pouch that can clip on the lens bag included with the zoom. Compact, useful and high quality.

I purchased this several months after the pro 40 to 150 zoom. I can say I am not disappointed. It is just what a quality 1.4 times converter should be (having used others.) Construction is solid and the optical performance as good as it gets. The price is also reasonable for the flexibility it delivers. When mounted on the 40-150 there is very little image quality difference. This extender is a must for bird photography.

If you're taking shots of the moon with your 40-150pro, get this adapter. The added detail without sacrificing sharpness is just awesome! Quite by surprise, I discovered that this teleconverter also works with my M. Zuiko 50mm Macro (4/3 mount). In this instance, the correct M4/3 to 4/3 adapter is essential. I actually have both the Panasonic and Olympus adapters. Trying the Olympus first (it is weather sealed afteral!) I found that it feels too tight and just won't quite lock into place with the teleconverter. I'm not sure if it would work by forcing it a bit, but the Panasonic adapter slides into place with minimal effort, so I chose to not risk damage. But combined with the teleconverter, my 50mm becomes a 70mm macro, and opens up new options. I'm sure the teleconverter would work on other 4/3 lenses as well, but the macro was just a really nice surprise!