Olympus M.Zuiko Digital ED 40-150 mm F2.8 PRO Lens, Telephoto Zoom, Suitable for All MFT Cameras (Olympus OM-D & PEN Models, Panasonic G Series), Black

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Neither Oly lens fulfills a critical need for me, but they would make taking photos more convenient in some situations. Focus is very reliable and it follow-focuses fast (especially if you turn EYE focus off - more so with the mk 1)

Offering long reach with an advanced feature-set and optical design, the M.Zuiko Digital ED 40-150mm f/2.8 PRO from Olympus is a versatile 80-300mm equivalent telephoto zoom for Micro Four Thirds mirrorless cameras. As part of the PRO series of advanced lenses, this zoom distinguishes itself with a bright f/2.8 constant maximum aperture for consistent illumination throughout the zoom range to suit working in a variety of lighting conditions. Its optical design makes use of a series of aspherical and low dispersion glass elements to suppress chromatic and spherical aberrations for notable sharpness and clarity, and a ZERO coating is also used to reduce flare and ghosting for high contrast, color-accurate imaging. The Olympus 40-150mm F2.8 Pro is an optically excellent, high-performance, metal-cased beast of a lens and perhaps the best telephoto zoom I’ve ever used. OLYMPUS DIGITAL CAMERAThe Olympus M.Zuiko Digital ED 40-150mm f/2.8 Pro telezoom has a very decent close-focus point of 0.7m, but this was achieved in a way that causes noticeable focus breathing at the 150mm end of the zoom range. It is a widely known fact that the angle of view of a lens depends not only on the focal length but also on the focus distance set, and this effect is particularly pronounced on this lens. While at infinity, the diagonal angle of view is essentially the same as with any other 300mm equivalent optic, there is a marked difference at shorter focus distances. The following shots were taken at a distance of a bit over 1.5m, or 5 feet. The first photo was taken with the new M.Zuiko Digital ED 40-150mm f/2.8 Pro lens at 150mm: Vignetting is very much NOT an issue with the Olympus 40-150mm ƒ/2.8 lens. At ƒ/2.8, there's a hint of vignetting at all focal lengths -- hovering around 0.25EVs of corner shading. When the lens is stopped down to ƒ/4 and beyond, the vignetting drops to around zero. But if 150mm is long enough and you typically shoot in good light or static subjects in any light, the tiny Olympus 40-150mm F/4 Pro might be all the lens you need.

Of course, time will tell. But based on the Olympus 40-150mm’s F4’s MTF, it appears to be an excellent performer with excellent sharpness across the entire frame. But if you’re photographing portraits or landscapes, speed hardly matters. Therefore, you might as well save some money and carry a lighter more compact lens.Maintaining a maximum aperture of f/2.8 across its zoom range, the construction of the lens is made up of 16 elements in 10 groups, with 1 Aspherical ED lens, 2 Aspherical lenses, 1 SED lens, 3 ED lenses and 1 HD lens making up the design.

It's a really good lens. And there are some nice innovations in it, that make gear heads like me go nuts. Dual element focus (two groups each with linear motors). There seem to be some improvements in autofocus speed but primary a really, really close focus distance. This is great!

Olympus 40-150mm f2.8 Pro design and build quality

But if you are ready to meet its price tag and willing to carry it, the Olympus 40-150mm F2.8 Pro is a formidable lens and will help you get shots you might otherwise miss. The Olympus M.Zuiko Digital ED 40-150mm can be bought on its own, or in a kit with the MC-14, a 1.4x teleconversion lens that goes between the lens and the camera body, as shown in the picture below.