I had heard very mixed reviews about this 1.4 converter but I really wanted more reach than the 40/150 F2.8 Pro zoom lens offered so I took a chance and purchased the MC-14. It's tiny, fits very securely and has given me excellent results so far.

No doubt that this is again the prove that Olympus is able to deliver outstanding lens craftsmanship. Matches perfectly my 40-150/2.8 PRO. No noticeable AF speed or IQ loss. looking forward to match up with the 300/4 PRO

Sharp; Fast; Very good IQ; Sealed

Price

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).

This is a great teleconverter if you are putting it on a Olympus body. For whatever reason it wasn't a good marriage to put it on my Lumix g9

The Olympus M.Zuiko Digital 1.4x Teleconverter MC-14 extends the reach of select Olympus lenses without sacrificing image quality, but it does reduce the amount of light that the lens captures.

Compact; Dust and splashproof design; Extends reach of lens by 1.4x

Very limited compatibility; Halves light-gathering capability

Wow .It works perfectly . Save me some money too.

Great for bird shots and moon shots.

Durable; Lightweight; Quick Focus; Sharp Focus; Strong Construction

The Olympus M.Zuiko Digital 1.4x Teleconverter MC-14 ($349.99) is a small accessory for select Olympus Micro Four Thirds lenses that extends the effective focal length by a factor of 1.4. The teleconverter doesn't significantly degrade image quality, which is good news for photographers who want to get a little bit more reach from their lenses, but like all 1.4x teleconverters it halves the amount of light that's captured by the lens. It won't work with every Micro Four Third lens, but if you do have one that it's compatible with and you want some extra reach, it's a worthwhile investment. The MC-14 ($349.00 at Amazon)  is very small and light. It measures just 0.9 by 2.7 inches (HD) and weighs 6 ounces. It's easy to slide into a pocket when not in use—Olympus includes both front and rear caps and a protective carrying case. It mounts to your Micro Four Thirds camera, and has its own lens mount to which to attach a lens. Right now it can only be used with one lens, the M.Zuiko ED...

The Olympus M.Zuiko Digital 1.4x Teleconverter MC-14 extends the reach of select Olympus lenses without sacrificing image quality, but it does reduce the amount of light that the lens captures.

Compact; Dust and splashproof design; Extends reach of lens by 1.4x

Very limited compatibility; Halves light-gathering capability