The lens is one of the best telezooms that we’ve tested, and aside from limiting its maximum aperture to f/4, the teleconverter doesn’t detract too much from image quality. At 40mm f/2.8 the M.Zuiko lens shows 2,357 lines per picture height on a center-weighted sharpness test, and that number drops to just 2,342 lines at 56mm f/4, the widest angle and aperture possible with the MC-14 attached. There is a steeper decline in sharpness at 105mm f/4 (2,291 lines), compared with the lens at the same zoom position without the MC-14 attached (2,411 lines at 70mm f/2.8), but there’s still plenty of detail in photos. At 150mm f/4 the lens and teleconverter combination shows 2,105 lines, versus 2,364 lines at 100mm f/2.8. All of these numbers are better than the 1,800 lines per picture height that we use to mark a photo as sharp, and that level of detail holds up to the edges of the frame. At no tested focal length did the lens drop below that mark. It’s certainly helpful that the MC-14 is attached to such a good lens, but due to its design you won’t be using it with anything besides lenses from Olympus’s PRO series. In that regard, the Olympus M.Zuiko Digital 1.4x Teleconverter MC-14 is a little limited. But if you often shoots sports, nature, or other subject matter that requires extreme telephoto focal lengths, the MC-14 is a worthwhile accessory to add to your kit. It adds some versatility to an already great telezoom in the 40-150mm, and we look forward to seeing what it can do when paired with the upcoming 300mmwhen you factor in its effect and the Micro Four Thirds sensor size, it will turn that lens into the equivalent of a 840mm f/5.6 prime on a full-frame system.
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