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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The physical aperture diaphragm construction is composed of 9 blades which produce a circular shaped aperture that should result in pretty circular blob highlights for out of focus elements.

Similarly to the previous comparison, you’ll again see more evidence of onion-ringing from the 40-150mm compared to the 75mm due to its optical construction, although again the zoom delivers a higher contrast image when the aperture on both is wide-open. With the sun in the center of the frame, this lens captured a disco ball of circular flare radiating from the light source.I used the 40-150mm on the Olympus OMD EM1 – a weather-sealed combination – during steady drizzle without complaint from either. Pro has a L-fn function button on the barrel that can be assigned to one of a number of functions from the custom menu on the camera. The focusing system relies on a dual linear voice coil motor design (VCM) to deliver a quiet and fast performance, and with a minimum focus distance of 70cm and an inner zoom mechanism that allows it to be no longer than 160mm, it looks set to be one of the most impressive Micro Four Thirds lenses going, or at least it does on paper.

So while the 40-150 lens is very sharp wide open at all focal lengths, our graphs indicate an extremely subtle drop in sharpness at 150mm ƒ/2.

But on the E-M1 the lens is very comfortable and a near perfect match for a moderately long telephoto zoom. Most subjects snapped-into focus more easily than before in Single AF modes, and upon examination the subjects were sharp at 100%. aperture and dual AF motors, the much lighter and cheaper Olympus 40-150mm F4 does, broadly speaking, the same thing.