Zooming to 70mm maintains the excellent centre sharpness at wide open aperture and the clarity towards the edges is improved over that at 40mm, reaching very good levels at maximum aperture. Again, peak quality across the frame is achieved at f/5.6, where sharpness is excellent across the frame. Olympus PEN-F + Olympus M.Zuiko 40-150mm f/4.0-5.6 R (145mm, 1/400 sec, f/5.6, ISO200) (Image credit: James Artaius) Olympus M.Zuiko 40-150mm f/4.0-5.6 R: Performance For those who are excited by technical specifications, it has 15 elements in 9 groups (2 ED lenses, 1 super ED lens, 1 HR lens, 2 aspherical lenses). The front element is coated with a new water-repellent fluorine coating that makes it much easier to remove moisture and water droplets from the lens. As I shoot on the shoreline a lot, that is a blessing. Then there’s that constant aperture. At telephoto, the Olympus 40-150 Pro’s larger F4 aperture is twice as bright as the F5.6 aperture on the cheaper Olympus F/4-5.6. And since you must use faster shutter speeds at telephoto to avoid camera shake – it does make a difference.

OM SYSTEM M.Zuiko Digital ED 40-150 F4.0 PRO; World’s Most

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Olympus M.Zuiko 40-150mm F4-5.6 R Mini Review ROBIN WONG : Olympus M.Zuiko 40-150mm F4-5.6 R Mini Review

Finally at 150mm, sharpness levels drop a little across the frame at maximum aperture, but remain very good in the centre whilst approaching good levels towards the edges. There is little difference in edges sharpness with the lens stopped down, although sharpness in the centre does reach excellent levels at f/8 at this focal length. I’ve mentioned how well balanced the M.Zuiko 40-150mm f2.8 Pro feels when attached to the OMD EM1, the internal zoom mechanism means the the front of the lens doesn’t extend when you turn the zoom ring, maintaining the same overall length and balance. The front element doesn’t rotate when focusing so you can use a circular polarizer with ease. The lens has a 72mm filter thread. If you only ever need 150mm, the 40-150/f2.8 will probably give you better results. It has a faster aperture, which gives you more flexibility, and when stopped down to f/4 is sharper at 150mm than the Panasonic-Leica is (79 lp/mm vs. ~61 lp/mm) as it's closer to wide open. The minimum focus distance of 0.9m is quite close for a lens with an angle of view equivalent to a 300mm lens - ISO200, 1/250, f/5.6, 150mm (35mm equiv – 300mm) Doing a common 8x10" prints and it renders lenses like 300mm f/4 moot by sharpness compared to 75-300mm @ 300mm as you are wasting resolution benefit in small print.Pantoprazole sodium sesquihydrate. Wooburn Green, High Wycombe: Takeda UK Ltd.; 2009 [revised 26 Oct. 2018]. [Accessed 12 Apr. 2019] (online) Available from: 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. Falloff of illumination towards the corners is well controlled. At 40mm the corners are only 0.5 stops darker than the image centre at maximum aperture and this level increases to 0.8 stops at 150mm. Stopping the lens down just one stop results in visually uniform illumination throughout the zoom range.