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!

I have had my micro 4/3, MC-14, 1.4 X tele converter for about a week, and it works very well on the 40-150 Pro lens. I get a reach of 210mm (420mm on a 35mm system), which gives a good image size at 40 to 50 feet. With my 50-200 and its 1.4X converter, at the same distance, a squirrel fills the frame about 35 or 40 percent; so this should result in the squirrel filling maybe 30 percent of the image frame, which would allow for a good composition. I’ll wait for a warmer day to put peanuts where I want the squirrel, and then wait for that magic moment. Image quality of everything I have shot thus far has produced very sharp images. I just have to adjust ISO high enough to get a faster shutter speed (if shooting in “A” mode) or select a faster shutter speed to compliment the focal length. When trying to be mobile, I like the feel of the set-up of my E-M1 with the 40-150 Pro and the MC-14, both with and without the HLD-7 battery grip; but definitely WITH the grip is better. Using a faster shutter speed still, say 1/2000, really helps when shooting a long lens hand held. (the lens and your converter make up your focal length) The only problem I find is, my MC-14 converter is Very tight when mounting to my E-M1; it is really difficult to remove. I do Not see how Olympus’s Quality Control or Engineering Design Team could miss tolerances so much on the MC-14, when they have the MMF-3 unit to go by, for example.

I was pleasantly surprised with the image quality I get with this teleconverter. I definitely recommend the M.Zuiko teleconverter!

I use this with my 40-150 mm pro lens and increases my reach to 410 mm f4 at the longest end. Even at that focal length there is not noticeable difference in sharpness or contrast. Most of the time I leave it with the lens for shooting birds and far away

I use this pretty frequent with the 2.8 40-150 Pro for birding. Great image quality