Olympus M.Zuiko Digital ED 300 mm F4.0 PRO Lens, Telephoto Zoom, Suitable for All MFT Cameras (Olympus OM-D & PEN Models, Panasonic G Series), Black

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I ended up missing some photos because of this – by the time I figured out why my autofocus wasn’t working, the opportune moment had passed! And when you add the MC-20 into the mix, it doubles the focal length yet again to give you a 1200mm equivalent lens. Combined with the maximum aperture, this can create a very nice bokeh and a ‘telephoto look’ for portraits of smaller animals. The close focus leads to so many different looks than when I shot full frame Nikon, but it also changed what I shoot. However, when it comes to Micro Four Thirds (MFT), teleconverters suddenly become a whole lot more exciting.

As you can see in the photos throughout this review, out-of-focus backgrounds are smooth and not distracting, with round out-of-focus highlights. The subject detection autofocus of the OM-1 with the lens’s quick autofocus made for the easiest bird photography of my life! Of course you can in theory build a small sensor with photo-diodes same size like one in FF sensor, and then noise will be well controlled, but resolution of the sensor will be badly affected. Nicholas clearly wrote that APERTURE is ‘changed’, and this is NOT true – a f/4 lens will be ALWAYS f/4, no matter if you mount it on M4/3, APS-C, FF or medium format camera.Please, clarify this as the ‘changed aperture’ is repeated too many times by too many people already.

The stabilization is most effective when paired with Olympus bodies, where synchronized image stabilization will give you up to 6 stops stabilization.However, keep in mind that crop factors also apply to aperture; so, using this lens is akin to using a 600mm f/8 on full-frame. There is also an image stabilization switch on the side of the lens, as well as an LN-f function button.