[Klaus]

My wife was so dissatisfied with her Olympus 75-300, that she first got herself a K-30 and a HD DA55-300, a great combination for BIF (birds in flight) photography.

 

Then she went one step further with a 70-300CX on a Nikon V2, a superb lens on a nice camera, a much sharper lens in its long end than most lenses I have tried, possibly sharper than the new Nikon 300mm lens (yes, I have used that one, practical size, yes, and nice in every respect, and just like the 70-300CX using the latest lens coatings; happy to say both work well on a Nikon 1 camera!).

 

None of the MFT 300mm zooms are really good (nor small). It is a mystery to me why Oly/Pana aren't fixing this gap.

 

The 70-300CX is a cool offering indeed. A bit pricey though (just like most of the CX stuff).