Canon 55-250 IS any good for micro 4/3 ?

Get the native Olympus 40-150 smaller lighter and cheaper, and you can adjust the aperture (cannot do that with EOS Lenses. Plus the EOS lens would be manual focus only, and the focus ring on the 55-250 is terrible).

 

The price of this lens plus an adapter won't be far short of the Panasonic 45-200mm, which would give you autofocus, OIS, and aperture control. I have a 55-250mm for my Canon but have never tried it on a Micro 4/3 camera.

 

another vote for the OLy 40-150. they are available at great prices and, even though I do not use mine SO often, I am astounded at the quality when I do

 

Panny 100-300 then. Or adapt an older, legacy lens that is longer (mounts from FD, MD, older Nikon, m42, etc.). The EOS lenses are at a disadvantage on m43.

 

The D7000 also has a cropped sensor, although still bigger than m4/3. The 70-300mm will give you an equivalent of 105-450mm (@ 1.5x).

 

Nikon APS-C = 1.5x,
Micro 4/3 = 2x,

so the Panasonic 100-300mm on a Micro 4/3 camera is equivalent to 200-600mm on full-frame.

 

I'm with Nic. I'd go with a used or broken from kit Panasonic 45-200 for that range. Canon EOS lenses are not worth the effort on :43: due to the lack of aperture control.