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 hope that Photography Life and you continue to offer M43 and other crop sensor lens/camera reviews.

F/4 lens will be always f/4, no matter how big is the sensor inside the camera you’ll mount it on: for example, if I mount my full frame 70-200/2. Of course, you are right in that the aperture is the same an exposure will be the same, but when talking about the real-world performance of the lens in terms of noise, there’s a reason why those 600 f/4 lenses are so coveted — a 300 f/4 on micro four thirds cannot replace one.If you measure the exposure trough this lens wide open on any M4/3 camera, and then the same scene with any FF 300 or 600mm lens open to f/4 and mounted on any FF camera – with same ISO you’ll get the same exposure time as on Olympus. Thus, it makes sense to say that a 300 f/4 on micro four thirds is like a 600 f/8 on full-frame, when you are talking about equalized viewing size in terms of both DOF and noise/total light gathering! Additionally, when this lens is paired with the newer Olympus bodies like the OM-1, the lens and camera work superbly together with excellent image stabilization and autofocus.

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! I am not sure whether I enjoyed reading the review more, or your photography with this lens Nicholas. If 300mm is simply not enough reach, the Olympus MC-14 and Olympus MC-20 are both compatible with the Olympus 300mm f/4. The teleconverter doubles the focal length of the master lens, which in the case of the 150-400mm results in an astonishing reach of 2000mm (working in tandem with the lens' integrated 1. This matters especially in the case of wildlife: in low-light scenarios, a 600 f/4 shot on full-frame will be much less noisy than a 300 f/4 shot on micro four thirds, where both shots have been equalized to the same viewing size.Pair it with the Olympus OM-D E-M1X and you also get the benefit of Sync IS (which employs the in-body and in-lens stabilization in tandem) that gives you 5 stops of image stabilization – meaning that you can shoot without a tripod. Please, clarify this as the ‘changed aperture’ is repeated too many times by too many people already. However, taking the Olympus 300mm f/4 as an example, the difference in magnified reach between the two lenses is a staggering 360mm (the MC-14 turning it into an 840mm equivalent, the MC-20 a 1200mm equivalent).